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( 2 Sep 03)
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* *
* Section 2 - Input Description *
* *
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This section of the manual describes the input to
GAMESS. The section is written in a reference, rather
than tutorial fashion. However, there are frequent
reminders that more information can be found on a
particular input group, or type of calculation, in the
'Further Information' section of this manual. There are
also a number of examples shown in the 'Input Examples'
section.
It is useful to note that this chapter of the manual
can be searched online by means of the "gmshelp" command,
if your computer is of the Unix type. A command such as
"gmshelp scf" will display the $SCF input group. With
no arguments, the gmshelp command will show you all input
group names. Type "q" to exit the pager, and note that
some pagers will let you back up by means of "b".
The order of this section is chosen to approximate the
order in which most people prepare their input ($CONTRL,
$BASIS/$DATA, $GUESS, and so on). The next page contains
a list of all possible input groups, in the order in which
they can be found in this section.
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*
name function module:routine
---- -------- --------------
Molecule, basis, wavefunction specification:
$CONTRL chemical control data INPUTA:START
$SYSTEM computer related control data INPUTA:START
$BASIS basis set INPUTB:BASISS
$DATA molecule, basis set INPUTB:MOLE
$ZMAT coded z-matrix ZMATRX:ZMATIN
$LIBE linear bend data ZMATRX:LIBE
$SCF HF-SCF wavefunction control SCFLIB:SCFIN
$SCFMI SCF-MI input control data SCFMI :MIINP
$DFT density functional input DFT :DFTINP
$MP2 2nd order Moller-Plesset MP2 :MP2INP
$CIS singly excited CI CISGRD:CISINP
$CISVEC vectors for CIS CISGRD:CISVRD
$CCINP coupled cluster input CCSDT :CCINP
$GUESS initial orbital selection GUESS :GUESMO
$VEC orbitals (formatted) GUESS :READMO
$MOFRZ freezes MOs during SCF runs EFPCOV:MFRZIN
Potential energy surface options:
$STATPT geometry search control STATPT:SETSIG
$TRUDGE nongradient optimization TRUDGE:TRUINP
$TRURST restart data for TRUDGE TRUDGE:TRUDGX
$FORCE hessian, normal coordinates HESS :HESSX
$CPHF coupled-Hartree-Fock options CPHF :CPINP
$HESS force constant matrix (formatted) HESS :FCMIN
$GRAD gradient vector (formatted) HESS :EGIN
$DIPDR dipole deriv. matrix (formatted) HESS :DDMIN
$VIB HESSIAN restart data (formatted) HESS :HSSNUM
$MASS isotope selection VIBANL:RAMS
$IRC intrinsic reaction path RXNCRD:IRCX
$VSCF vibrational SCF and MP2 VSCF :VSCFIN
$VIBSCF VSCF restart data (formatted) VSCF :VGRID
$DRC dynamic reaction path DRC :DRCDRV
$GLOBOP Monte Carlo global optiization GLOBOP:GLOPDR
$GRADEX gradient extremal path GRADEX:GRXSET
$SURF potential surface scan SURF :SRFINP
continued on the next page...
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*
name function module:routine
---- -------- --------------
Interpretation, properties:
$LOCAL orbital localization control LOCAL :LMOINP
$TWOEI J,K integrals (formatted) LOCCD :TWEIIN
$TRUNCN localized orbital truncations EFPCOV:TRNCIN
$ELMOM electrostatic moments PRPLIB:INPELM
$ELPOT electrostatic potential PRPLIB:INPELP
$ELDENS electron density PRPLIB:INPELD
$ELFLDG electric field/gradient PRPLIB:INPELF
$POINTS property calculation points PRPLIB:INPPGS
$GRID property calculation mesh PRPLIB:INPPGS
$PDC MEP fitting mesh PRPLIB:INPPDC
$MOLGRF orbital plots PARLEY:PLTMEM
$STONE distributed multipole analysis PRPPOP:STNRD
$RAMAN Raman intensity RAMAN :RAMANX
$ALPDR alpha polar. der. (formatted) RAMAN :ADMIN
$MOROKM Morokuma energy decomposition MOROKM:MOROIN
$FFCALC finite field polarizabilities FFIELD:FFLDX
$TDHF time dependent HF NLO properties TDHF :TDHFX
Solvation models:
$EFRAG effective fragment potentials EFINP :EFINP
$FRAGNAME specific named fragment pot. EFINP :RDSTFR
$FRGRPL inter-fragment repulsion EFINP :RDDFRL
$PRTEFP simplified EFP generation EFINP :PREFIN
$DAMP EFP multipole screening fit CHGPEN:CGPINP
$DAMPGS initial guess screening params CHGPEN:CGPINP
$PCM polarizable continuum model PCM :PCMINP
$PCMGRD PCM gradient contrl PCMCV2:PCMGIN
$PCMCAV PCM cavity generation PCM :MAKCAV
$TESCAV PCM cavity tesselation PCMCV2:TESIN
$NEWCAV PCM escaped charge cavity PCM :DISREP
$IEFPCM PCM integral equation form. data PCM :IEFDAT
$PCMITR PCM iterative IEF input PCMIEF:ITIEFIN
$DISBS PCM dispersion basis set PCMDIS:ENLBS
$DISREP PCM dispersion/repulsion PCMVCH:MORETS
$COSGMS conductor-like screening model COSMO :COSMIN
$SCRF self consistent reaction field SCRF :ZRFINP
Integral and integral modification options:
$ECP effective core potentials ECPLIB:ECPPAR
$MCP model core potentials MCPINP:MMPRED
$RELWFN relativistic correction INPUTB:RWFINP
$EFIELD external electric field PRPLIB:INPEF
$INTGRL format for 2e- integrals INT2A :INTIN
$FMM fast multipole method QMFM :QFMMIN
$TRANS integral transformation TRANS :TRFIN
continued on the next page...
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*
name function module:routine
---- -------- --------------
MCSCF and CI wavefunctions, and their properties:
$CIINP control over CI calculation GAMESS:WFNCI
$DET determinant full CI for MCSCF ALDECI:DETINP
$CIDET determinant full CI ALDECI:DETINP
$GEN determinant general CI for MCSCF ALGNCI:GCIINP
$CIGEN determinant general CI ALGNCI:GCIINP
$ORMAS occ. restricted mult. act. sp. ORMAS :FCINPT
$GCILST general determinant list ALGNCI:GCIGEN
$SODET second order determinant CI FSODCI:SOCINP
$DRT distinct row table for MCSCF GUGDRT:ORDORB
$CIDRT distinct row table for CI GUGDRT:ORDORB
$MCSCF parameters for MCSCF MCSCF :MCSCF
$MCQDPT multireference pert. theory MCQDPT:MQREAD
$CISORT integral sorting GUGSRT:GUGSRT
$GUGEM Hamiltonian matrix formation GUGEM :GUGAEM
$GUGDIA Hamiltonian eigenvalues/vectors GUGDGA:GUGADG
$GUGDM 1e- density matrix GUGDM :GUGADM
$GUGDM2 2e- density matrix GUGDM2:GUG2DM
$LAGRAN CI lagrangian matrix LAGRAN:CILGRN
$TRFDM2 2e- density backtransformation TRFDM2:TRF2DM
$TRANST transition moments, spin-orbit TRNSTN:TRNSTX
* this column is more useful to programmers than to users.
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$CONTRL
==========================================================
$CONTRL group (optional)
This is a free format group specifying global switches.
SCFTYP specifies the self-consistent field
wavefunction. You may choose from
= RHF Restricted Hartree Fock calculation
(default)
= UHF Unrestricted Hartree Fock calculation
= ROHF Restricted open shell Hartree-Fock.
(high spin, see GVB for low spin)
= GVB Generalized valence bond wavefunction
or OCBSE type ROHF. (needs $SCF input)
= MCSCF Multiconfigurational SCF wavefunction
(this requires $DET or $DRT input)
= NONE indicates a single point computation,
rereading a converged SCF function.
This option requires that you select
CITYP=ALDET, ORMAS, FSOCI, GENCI, or
GUGA, requesting only RUNTYP=ENERGY or
TRANSITN, and using GUESS=MOREAD.
The treatment of electron correlation for the above SCF
wavefunctions is controlled by the keywords MPLEVL, CITYP,
and CCTYP contained in this group, or DFTTTYP which is
given in $DFT. Obviously, at most one of MPLEVL, CITYP,
CCTYP, or DFTTYP may be chosen in any given run.
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$CONTRL
MPLEVL = chooses Moller-Plesset perturbation
theory level, after the SCF.
See $MP2 and $MCQDPT input groups.
= 0 skip the MP computation (default)
= 2 perform second order energy correction.
MP2 (aka MBPT(2)) is only implemented for RHF, UHF, ROHF,
and MCSCF wavefunctions. Gradients are available for RHF
and UHF, so for the others you may choose a RUNTYP of
ENERGY, TRUDGE, SURFACE, or FFIELD only.
CITYP = chooses CI computation after the SCF,
for any SCFTYP except UHF.
= NONE skips the CI. (default)
= CIS single excitations from a SCFTYP=RHF
reference, only. This is for the
treatment of excited states, with
analytic nuclear gradients available.
See the $CIS input group.
= ALDET runs the Ames Laboratory determinant
full CI package, requiring $CIDET
input. Use with RUNTYP=ENERGY only.
= ORMAS runs an Occupation Restricted Multiple
Active Space determinant CI. The input
is $CIDET and $ORMAS.
= FSOCI runs a full second order CI using
determinants, with RUNTYP=ENERGY only.
The input is $CIDET and $SODET.
= GENCI runs a determinant CI program that
permits arbitrary specification of
the determinants, requiring $CIGEN
input. Use with RUNTYP=ENERGY only.
= GUGA runs the Unitary Group CI package,
which requires $CIDRT input.
Gradients are available only for RHF,
so for other SCFTYPs, you may choose
only RUNTYP=ENERGY, TRUDGE, SURFACE,
FFIELD, TRANSITN.
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$CONTRL
CCTYP chooses a Coupled-Cluster computation
after SCF, available for SCFTYP=RHF.
See also the $CCINP group.
= NONE skips CC computation (default).
= LCCD perform a coupled-cluster calculation
using the linearized coupled-cluster
method with double excitations.
= CCD perform a CC calculation using the
coupled-cluster method with double
excitations.
= CCSD perform a CC calculation using the
coupled-cluster method with single
and double excitations.
= CCSD(T) in addition to the CCSD run, the
non-iterative triples corrections are
calculated to give the standard CCSD[T]
and CCSD(T) energies.
= R-CC in addition to standard CCSD, CCSD[T],
and CCSD(T) calculations, renormalized
R-CCSD[T] and R-CCSD(T) calculations are
performed. The cost of the renormalized
calculations equals standard CCSD(T).
= CR-CC in addition to CCSD, CCSD[T], CCSD(T),
R-CCSD[T], and R-CCSD(T) calculations,
the completely renormalized CR-CCSD[T]
and CR-CCSD(T) enegies are computed.
The cost of CR-CCSD[T] and CR-CCSD(T)
calculations, in their noniterative
triples corrections portion, is twice
the standard [T] and (T) corrections.
The most reasonable choices are CCSD, CCSD(T), or CR-CC.
Analytic gradients are not available, so use CCTYP only
for RUNTYP=ENERGY, TRUDGE, SURFACE, or maybe FFIELD.
Any publication describing the results of CC calculations
obtained using GAMESS should give reference to
P. Piecuch, S.A. Kucharski, K. Kowalski, and M. Musial,
Comput.Phys. Commun., 149, 71-96, 2002
For more information about the R-CCSD(T) and CR-CCSD(T)
methods, see Section 4, 'Further Information'.
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$CONTRL
RUNTYP specifies the type of computation, for
example at a single geometry point:
= ENERGY Molecular energy. (default)
= GRADIENT Molecular energy plus gradient.
= HESSIAN Molecular energy plus gradient plus
second derivatives, including harmonic
harmonic vibrational analysis. See the
$FORCE and $CPHF input groups.
multiple geometry options:
= OPTIMIZE Optimize the molecular geometry using
analytic energy gradients. See $STATPT.
= TRUDGE Non-gradient total energy minimization.
See groups $TRUDGE and $TRURST.
= SADPOINT Locate saddle point (transition state).
See the $STATPT group.
= IRC Follow intrinsic reaction coordinate.
See the $IRC group.
= VSCF Compute anharmonic vibrational
corrections (see $VSCF)
= DRC Follow dynamic reaction coordinate.
See the $DRC group.
= GLOBOP Monte Carlo global optimization.
See $GLOBOP.
= GRADEXTR Trace gradient extremal.
See the $GRADEX group.
= SURFACE Scan linear cross sections of the
potential energy surface. See $SURF.
single geometry property options:
= PROP Properties will be calculated. A $DATA
deck and converged $VEC group should be
input. Optionally, orbital localization
can be done. See $ELPOT, etc.
= RAMAN computes Raman intensities, see $RAMAN.
= MOROKUMA Performs monomer energy decomposition.
See the $MOROKM group.
= TRANSITN Compute radiative transition moment or
spin-orbit coupling. See $TRANST group.
= FFIELD applies finite electric fields, most
commonly to extract polarizabilities.
See the $FFCALC group.
= TDHF analytic computation of time dependent
polarizabilities. See the $TDHF group.
= MAKEFP creates an effective fragment potential.
* * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Note that RUNTYPs which require the nuclear gradient are
GRADIENT, HESSIAN, OPTIMIZE, SADPOINT,
GLOBOP, IRC, GRADEXTR, and DRC
These may not be used for any CI, MP2, or CC calculation
unless the gradient can be computed, as indicated above.
* * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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$CONTRL
EXETYP = RUN Actually do the run. (default)
= CHECK Wavefunction and energy will not be
evaluated. This lets you speedily
check input and memory requirements.
See the overview section for details.
Note that you must set PARALL=.TRUE.
in $SYSTEM to test distributed memory
allocations.
= DEBUG Massive amounts of output are printed,
useful only if you hate trees.
= routine Maximum output is generated by the
routine named. Check the source for
the routines this applies to.
MAXIT = Maximum number of SCF iteration cycles.
Pertains only to RHF, UHF, ROHF, or
GVB runs. See also MAXIT in $MCSCF.
(default = 30)
* * * * * * *
ICHARG = Molecular charge. (default=0, neutral)
MULT = Multiplicity of the electronic state
= 1 singlet (default)
= 2,3,... doublet, triplet, and so on.
ICHARG and MULT are used directly for RHF, UHF, ROHF.
For GVB, these are implicit in the $SCF input, while
for MCSCF or CI, these are implicit in $DRT/$CIDRT or
$DET/$CIDET input. You must still give them correctly.
* * * * * * *
ECP = effective core potential control.
= NONE all electron calculation (default).
= READ read the potentials in $ECP group.
= SBKJC use Stevens, Basch, Krauss, Jasien,
Cundari potentials for all heavy
atoms (Li-Rn are available).
= HW use Hay, Wadt potentials for all the
heavy atoms (Na-Xe are available).
= MCP use Huzinaga's Model Core Potentials.
Gradients are not available, and see
the $MCP group for how to input these.
* * * * * * *
RELWFN = NONE (default) See also $RELWFN input group.
= NESC normalised elimination of small component,
the method of K. Dyall
= RESC relativistic elimination of small component,
the method of T. Nakajima and K. Hirao.
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$CONTRL
* * * the next three control molecular geometry * * *
COORD = choice for molecular geometry in $DATA.
= UNIQUE only the symmetry unique atoms will be
given, in Cartesian coords (default).
= HINT only the symmetry unique atoms will be
given, in Hilderbrandt style internals.
= CART Cartesian coordinates will be input.
Please read the warning just below!!!
= ZMT GAUSSIAN style internals will be input.
= ZMTMPC MOPAC style internals will be input.
= FRAGONLY means no part of the system is treated
by ab initio means, hence $DATA is not
given. The system is specified by $EFRAG.
Note that the CART, ZMT, ZMTMPC choices require input of
all atoms in the molecule. These three also orient the
molecule, and then determine which atoms are unique. The
reorientation is very likely to change the order of the
atoms from what you input. When the point group contains
a 3-fold or higher rotation axis, the degenerate moments
of inertia often cause problems choosing correct symmetry
unique axes, in which case you must use COORD=UNIQUE
rather than Z-matrices.
Warning: The reorientation into principal axes is done
only for atomic coordinates, and is not applied to the
axis dependent data in the following groups: $VEC, $HESS,
$GRAD, $DIPDR, $VIB, nor Cartesian coords of effective
fragments in $EFRAG. COORD=UNIQUE avoids reorientation,
and thus is the safest way to read these.
Note that the choices CART, ZMT, ZMTMPC require the use
of a $BASIS group to define the basis set. The first
two choices might or might not use $BASIS, as you wish.
UNITS = distance units, any angles must be in degrees.
= ANGS Angstroms (default)
= BOHR Bohr atomic units
NZVAR = 0 Use Cartesian coordinates (default).
= M If COORD=ZMT or ZMTMPC and a $ZMAT is not given:
the internal coordinates will be those defining
the molecule in $DATA. In this case, $DATA must
not contain any dummy atoms. M is usually 3N-6,
or 3N-5 for linear.
= M For other COORD choices, or if $ZMAT is given:
the internal coordinates will be those defined
in $ZMAT. This allows more sophisticated
internal coordinate choices. M is ordinarily
3N-6 (3N-5), unless $ZMAT has linear bends.
NZVAR refers mainly to the coordinates used by OPTIMIZE
or SADPOINT runs, but may also print the internal's
values for other run types. You can use internals to
define the molecule, but Cartesians during optimizations!
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$CONTRL
LOCAL = controls orbital localization.
= NONE Skip localization (default).
= BOYS Do Foster-Boys localization.
= RUEDNBRG Do Edmiston-Ruedenberg localization.
= POP Do Pipek-Mezey population localization.
See the $LOCAL group. Localization
does not work for SCFTYP=GVB or CITYP.
ISPHER = Spherical Harmonics option
= -1 Use Cartesian basis functions to construct
symmetry-adapted linear combination (SALC)
of basis functions. The SALC space is the
linear variation space used. (default)
= 0 Use spherical harmonic functions to create
SALC functions, which are then expressed
in terms of Cartesian functions. The
contaminants are not dropped, hence this
option has EXACTLY the same variational
space as ISPHER=-1. The only benefit to
obtain from this is a population analysis
in terms of pure s,p,d,f,g functions.
= +1 Same as ISPHER=0, but the function space
is truncated to eliminate all contaminant
Cartesian functions [3S(D), 3P(F), 4S(G),
and 3D(G)] before constructing the SALC
functions. The computation corresponds
to the use of a spherical harmonic basis.
QMTTOL = linear dependence threshhold
Any functions in the SALC variational space whose
eigenvalue of the overlap matrix is below this
tolerence is considered to be linearly dependent.
Such functions are dropped from the variational
space. What is dropped is not individual basis
functions, but rather some linear combination(s)
of the entire basis set that represent the linear
dependent part of the function space. The default
is a reasonable value for most purposes, 1.0E-6.
When many diffuse functions are used, it is common
to see the program drop some combinations. On
occasion, in multi-ring molecules, we have raised
QMTTOL to 3.0E-6 to obtain SCF convergence, at the
cost of some energy.
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$CONTRL
* * * interfaces to other programs * * *
MOLPLT = flag that produces an input deck for a molecule
drawing program distributed with GAMESS.
(default is .FALSE.)
PLTORB = flag that produces an input deck for an orbital
plotting program distributed with GAMESS.
(default is .FALSE.)
AIMPAC = flag to create an input deck for Bader's Atoms
In Molecules properties code. (default=.FALSE.)
For information about this program, see the URL
http://www.chemistry.mcmaster.ca/faculty/bader/aim
FRIEND = string to prepare input to other quantum
programs, choose from
= HONDO for HONDO 8.2
= MELDF for MELDF
= GAMESSUK for GAMESS (UK Daresbury version)
= GAUSSIAN for Gaussian 9x
= ALL for all of the above
PLTORB, MOLPLT, and AIMPAC decks are written to file
PUNCH at the end of the job. Thus all of these correspond
to the final geometry encountered during jobs such as
OPTIMIZE, SAPDOINT, IRC...
In contrast, selecting FRIEND turns the job into a
CHECK run only, no matter how you set EXETYP. Thus the
geometry is that encountered in $DATA. The input is
added to the PUNCH file, and may require some (usually
minimal) massaging.
PLTORB and MOLPLT are written even for EXETYP=CHECK.
AIMPAC requires at least RUNTYP=PROP.
The NBO program of Frank Weinhold's group can be
attached to GAMESS. The input to control the natural
bond order analysis is read by the add in code, so is
not described here. The NBO program is available by
anonymous FTP to ftp.osc.edu, in the directory
pub/chemistry/software/SOURCES/FORTRAN/nbo
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$CONTRL
* * * computation control switches * * *
For the most part, the default is the only sensible
value, and unless you are sure of what you are doing,
these probably should not be touched.
NPRINT = Print/punch control flag
See also EXETYP for debug info.
(options -7 to 5 are primarily debug)
= -7 Extra printing from Boys localization.
= -6 debug for geometry searches
= -5 minimal output
= -4 print 2e-contribution to gradient.
= -3 print 1e-contribution to gradient.
= -2 normal printing, no punch file
= 1 extra printing for basis,symmetry,ZMAT
= 2 extra printing for MO guess routines
= 3 print out property and 1e- integrals
= 4 print out 2e- integrals
= 5 print out SCF data for each cycle.
(Fock and density matrices, current MOs
= 6 same as 7, but wider 132 columns output.
This option isn't perfect.
= 7 normal printing and punching (default)
= 8 more printout than 7. The extra output
is (AO) Mulliken and overlap population
analysis, eigenvalues, Lagrangians, ...
= 9 everything in 8 plus Lowdin population
analysis, final density matrix.
NOSYM = 0 the symmetry specified in $DATA is used
as much as possible in integrals, SCF,
gradients, etc. (this is the default)
= 1 the symmetry specified in the $DATA group
is used to build the molecule, then
symmetry is not used again. Some GVB
or MCSCF runs (those without a totally
symmetric charge density) require you
request no symmetry.
INTTYP = POPLE use fast Pople-Hehre routines for sp integral
blocks, and HONDO Rys polynomial code for
all other integrals. (default)
= HONDO use HONDO/Rys integrals for all integrals.
This option produces very slightly more
accurate integrals but is also slower.
NORMF = 0 normalize the basis functions (default)
= 1 no normalization
NORMP = 0 input contraction coefficients refer to
normalized Gaussian primitives. (default)
= 1 the opposite.
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$CONTRL
ITOL = primitive cutoff factor (default=20)
= n products of primitives whose exponential
factor is less than 10**(-n) are skipped.
ICUT = n integrals less than 10.0**(-n) are not
saved on disk. (default = 9). Direct
SCF will calculate to a cutoff 1.0d-10
or 5.0d-11 depending on FDIFF=.F. or .T.
* * * restart options * * *
IREST = restart control options
(for OPTIMIZE run restarts, see $STATPT)
Note that this option is unreliable!
= -1 reuse dictionary file from previous run,
useful with GEOM=DAF and/or GUESS=MOSAVED.
Otherwise, this option is the same as 0.
= 0 normal run (default)
= 1 2e restart (1-e integrals and MOs saved)
= 2 SCF restart (1-,2-e integrls and MOs saved)
= 3 1e gradient restart
= 4 2e gradient restart
GEOM = select where to obtain molecular geometry
= INPUT from $DATA input (default for IREST=0)
= DAF read from DICTNRY file (default otherwise)
As noted in the first chapter, binary file restart is
not a well tested option!
==========================================================
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$SYSTEM
==========================================================
$SYSTEM group (optional)
This group provides global control information for
your computer's operation. This is system related input,
and will not seem particularly chemical to you!
TIMLIM = time limit, in minutes. Set to about 95 percent
of the time limit given to the batch job so that
GAMESS can stop itself gently. (default=600.0)
MWORDS = the maximum replicated memory which your job can
use, on every node. This is given in units of
1,000,000 words (as opposed to 1024*1024 words),
where a word is always a 64 bit quantity. Most
systems allocate this memory at run time, but
some more primitive systems may have an upper
limit chosen at compile time. (default=1)
In case finer control over the memory is needed,
this value can be given in units of words by
using the keyword MEMORY instead of MWORDS.
MEMDDI = the grand total memory needed for the distributed
data interface (DDI) storage, given in units of
1,000,000 words. See Chapter 5 of this manual for
an extended explanation of running with MEMDDI.
note: the memory required on each node for a run using
p processors is therefore MEMDDI/p + MWORDS.
The parallel runs that currently require MEMDDI are:
SCFTYP=RHF MPLEVL=2 energy or gradient
SCFTYP=UHF MPLEVL=2 energy or gradient
SCFTYP=ROHF MPLEVL=2 OSPT=ZAPT energy
SCFTYP=MCSCF MPLEVL=2 energy
SCFTYP=MCSCF FULLNR=.TRUE.
SCFTYP=any CITYP=GUGA
All other parallel runs should enter MEMDDI=0.
PARALL = a flag to cause the distributed data parallel
MP2 program to execute the parallel algorithm,
even if you are running on only one node.
The main purpose of this is to allow you to
do EXETYP=CHECK runs to learn what the correct
value of MEMDDI needs to be.
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KDIAG = diagonalization control switch
= 0 use a vectorized diagonalization routine
if one is available on your machine,
else use EVVRSP. (default)
= 1 use EVVRSP diagonalization. This may
be more accurate than KDIAG=0.
= 2 use GIVEIS diagonalization
(not as fast or reliable as EVVRSP)
= 3 use JACOBI diagonalization
(this is the slowest method)
COREFL = a flag to indicate whether or not GAMESS
should produce a "core" file for debugging
when subroutine ABRT is called to kill
a job. This variable pertains only to
UNIX operating systems. (default=.FALSE.)
* * * the next three refer to parallel GAMESS * * *
The next three apply only to parallel runs, and as they
are more or less obsolete, their use is discourged.
BALTYP = Parallel load balence scheme
LOOP turns off dynamic load balancing (DLB)
NXTVAL uses dynamic load balancing
(default = LOOP)
XDR = a flag to indicate whether or not messages
should be converted into a generic format
known as external data representation.
If true, messages can exchange between
machines of different vendors, at the cost
of performing the data type conversions.
(default=.FALSE.) --inactive at present--
PTIME = a logical flag to print extra timing info
during parallel runs. This is not currently
implemented.
==========================================================
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$BASIS
==========================================================
$BASIS group (optional)
This group allows certain standard basis sets to be
easily given. If this group is omitted, the basis set
must be given instead in the $DATA group.
GBASIS = Name of the Gaussian basis set.
= MINI - Huzinaga's 3 gaussian minimal basis set.
Available H-Rn.
= MIDI - Huzinaga's 21 split valence basis set.
Available H-Rn.
= STO - Pople's STO-NG minimal basis set.
Available H-Xe, for NGAUSS=2,3,4,5,6.
= N21 - Pople's N-21G split valence basis set.
Available H-Xe, for NGAUSS=3.
Available H-Ar, for NGAUSS=6.
= N31 - Pople's N-31G split valence basis set.
Available H-Ne,P-Cl for NGAUSS=4.
Available H-He,C-F for NGAUSS=5.
Available H-Zn, for NGAUSS=6.
For Ga-Kr, N31 selects the BC basis.
= N311 - Pople's "triple split" N-311G basis set.
Available H-Ne, for NGAUSS=6.
Selecting N311 implies MC for Na-Ar.
= DZV - "double zeta valence" basis set.
a synonym for DH for H,Li,Be-Ne,Al-Cl.
(14s,9p,3d)/[5s,3p,1d] for K-Ca.
(14s,11p,5d/[6s,4p,1d] for Ga-Kr.
= DH - Dunning/Hay "double zeta" basis set.
(3s)/[2s] for H.
(9s,4p)/[3s,2p] for Li.
(9s,5p)/[3s,2p] for Be-Ne.
(11s,7p)/[6s,4p] for Al-Cl.
= TZV - "triple zeta valence" basis set.
(5s)/[3s] for H.
(10s,3p)/[4s,3p] for Li.
(10s,6p)/[5s,3p] for Be-Ne.
a synonym for MC for Na-Ar.
(14s,9p)/[8s,4p] for K-Ca.
(14s,11p,6d)/[10s,8p,3d] for Sc-Zn.
= MC - McLean/Chandler "triple split" basis.
(12s,9p)/[6s,5p] for Na-Ar.
Selecting MC implies 6-311G for H-Ne.
additional values for GBASIS are on the next page.
1
* * * the next two are ECP bases only * * *
GBASIS = SBKJC- Stevens/Basch/Krauss/Jasien/Cundari
valence basis set, for Li-Rn. This choice
implies an unscaled -31G basis for H-He.
= HW - Hay/Wadt valence basis.
This is a -21 split, available Na-Xe,
except for the transition metals.
This implies a 3-21G basis for H-Ne.
* * * semiempirical basis sets * * *
The elements for which these exist can be found
in the 'further information' section of this
manual. If you pick one of these, all other data
in this group is ignored. Semi-empirical runs
actually use valence-only STO bases, not GTOs.
GBASIS = MNDO - selects MNDO model hamiltonian
= AM1 - selects AM1 model hamiltonian
= PM3 - selects PM3 model hamiltonian
NGAUSS = the number of Gaussians (N). This parameter
pertains only to GBASIS=STO, N21, N31, or N311.
NDFUNC = number of heavy atom polarization functions to
be used. These are usually d functions, except
for MINI/MIDI. The term "heavy" means Na on up
when GBASIS=STO, HW, or N21, and from Li on up
otherwise. The value may not exceed 3. The
variable POLAR selects the actual exponents to
be used, see also SPLIT2 and SPLIT3. (default=0)
NFFUNC = number of heavy atom f type polarization
functions to be used on Li-Cl. This may only
be input as 0 or 1. (default=0)
NPFUNC = number of light atom, p type polarization
functions to be used on H-He. This may not
exceed 3, see also POLAR. (default=0)
DIFFSP = flag to add diffuse sp (L) shell to heavy atoms.
Heavy means Li-F, Na-Cl, Ga-Br, In-I, Tl-At.
The default is .FALSE.
DIFFS = flag to add diffuse s shell to hydrogens.
The default is .FALSE.
Warning: if you use diffuse functions, please read QMTTOL
and INTTYP in the $CONTRL group for numerical concerns.
1
$BASIS
POLAR = exponent of polarization functions
= POPLE (default for all other cases)
= POPN311 (default for GBASIS=N311, MC)
= DUNNING (default for GBASIS=DH, DZV)
= HUZINAGA (default for GBASIS=MINI, MIDI)
= HONDO7 (default for GBASIS=TZV)
SPLIT2 = an array of splitting factors used when NDFUNC
or NPFUNC is 2. Default=2.0,0.5
SPLIT3 = an array of splitting factors used when NDFUNC
or NPFUNC is 3. Default=4.00,1.00,0.25
EXTFIL = a flag to read basis sets from an external file,
defined by EXTBAS, instead of $DATA.
No external file is provided with GAMESS, instead
you would supply your own. The GBASIS keyword
must give an 8 character string, obviously not
using any internally stored names. Every atom
must be defined in the external file by a line
giving the chemical symbol, and this string.
Following this header line, give the basis in
free format $DATA style, containing only S, P, D,
F, G, and L shells, and terminating each atom by
the usual blank line. The GBASIS string allows
you to have several families of bases in the same
file, identified by different strings.
(default=.false.)
==========================================================
The splitting factors are from the Pople school, and are
probably too far apart. See for example the Binning and
Curtiss paper. For example, the SPLIT2 value will usually
cause an INCREASE over the 1d energy at the HF level for
hydrocarbons.
The actual exponents used for polarization functions, as
well as for diffuse sp or s shells, are described in the
'Further References' section of this manual. This section
also describes the sp part of the basis set chosen by
GBASIS fully, with all references cited.
Note that GAMESS always punches a full $DATA group. Thus,
if $BASIS does not quite cover the basis you want, you can
obtain this full $DATA group from EXETYP=CHECK, and then
change polarization exponents, add Rydbergs, etc.
1
$DATA
==========================================================
$DATA group (required)
$DATAS group (if NESC chosen, gives small component basis)
$DATAL group (if NESC chosen, gives large component basis)
This group describes the global molecular data such as
point group symmetry, nuclear coordinates, and possibly
the basis set. It consists of a series of free format
card images. See $RELWFN for more information on large and
small component basis sets. The input structure of $DATAS
and $DATAL is identical to the COORD=UNIQUE $DATA input.
----------------------------------------------------------
-1- TITLE a single descriptive title card.
----------------------------------------------------------
-2- GROUP, NAXIS
GROUP is the Schoenflies symbol of the symmetry group,
you may choose from
C1, Cs, Ci, Cn, S2n, Cnh, Cnv, Dn, Dnh, Dnd,
T, Th, Td, O, Oh.
NAXIS is the order of the highest rotation axis, and
must be given when the name of the group contains an N.
For example, "Cnv 2" is C2v. "S2n 3" means S6. Use of
NAXIS up to 8 is supported in each axial groups.
For linear molecules, choose either Cnv or Dnh, and enter
NAXIS as 4. Enter atoms as Dnh with NAXIS=2. If the
electronic state of either is degenerate, check the note
about the effect of symmetry in the electronic state
in the SCF section of REFS.DOC.
----------------------------------------------------------
In order to use GAMESS effectively, you must be able
to recognize the point group name for your molecule. This
presupposes a knowledge of group theory at about the level
of Cotton's "Group Theory", Chapter 3.
Armed with only the name of the group, GAMESS is able
to exploit the molecular symmetry throughout almost all of
the program, and thus save a great deal of computer time.
GAMESS does not require that you know very much else about
group theory, although a deeper knowledge (character
tables, irreducible representations, term symbols, and so
on) is useful when dealing with the more sophisticated
wavefunctions.
1
$DATA
Cards -3- and -4- are quite complicated, and are rarely
given. A *SINGLE* blank card may replace both cards -3-
and -4-, to select the 'master frame', which is defined on
the next page. If you choose to enter a blank card, skip
to the bottom of the next page.
Note!
If the point group is C1 (no symmetry), skip over cards
-3- and -4- (which means no blank card).
----------------------------------------------------------
-3- X1, Y1, Z1, X2, Y2, Z2
For C1 group, there is no card -3- or -4-.
For CI group, give one point, the center of inversion.
For CS group, any two points in the symmetry plane.
For axial groups, any two points on the principal axis.
For tetrahedral groups, any two points on a two-fold axis.
For octahedral groups, any two points on a four-fold axis.
----------------------------------------------------------
-4- X3, Y3, Z3, DIRECT
third point, and a directional parameter.
For CS group, one point of the symmetry plane,
noncollinear with points 1 and 2.
For CI group, there is no card -4-.
For other groups, a generator sigma-v plane (if any) is
the (x,z) plane of the local frame (CNV point groups).
A generator sigma-h plane (if any) is the (x,y) plane of
the local frame (CNH and dihedral groups).
A generator C2 axis (if any) is the x-axis of the local
frame (dihedral groups).
The perpendicular to the principal axis passing through
the third point defines a direction called D1. If
DIRECT='PARALLEL', the x-axis of the local frame coincides
with the direction D1. If DIRECT='NORMAL', the x-axis of
the local frame is the common perpendicular to D1 and the
principal axis, passing through the intersection point of
these two lines. Thus D1 coincides in this case with the
negative y axis.
----------------------------------------------------------
1
$DATA
The 'master frame' is just a standard orientation for
the molecule. By default, the 'master frame' assumes that
1. z is the principal rotation axis (if any),
2. x is a perpendicular two-fold axis (if any),
3. xz is the sigma-v plane (if any), and
4. xy is the sigma-h plane (if any).
Use the lowest number rule that applies to your molecule.
Some examples of these rules:
Ammonia (C3v): the unique H lies in the XZ plane (R1,R3).
Ethane (D3d): the unique H lies in the YZ plane (R1,R2).
Methane (Td): the H lies in the XYZ direction (R2). Since
there is more than one 3-fold, R1 does not apply.
HP=O (Cs): the mirror plane is the XY plane (R4).
In general, it is a poor idea to try to reorient the
molecule. Certain sections of the program, such as the
orbital symmetry assignment, do not know how to deal with
cases where the 'master frame' has been changed.
Linear molecules (C4v or D4h) must lie along the z axis,
so do not try to reorient linear molecules.
You can use EXETYP=CHECK to quickly find what atoms are
generated, and in what order. This is typically necessary
in order to use the general $ZMAT coordinates.
* * * *
Depending on your choice for COORD in $CONTROL,
if COORD=UNIQUE, follow card sequence U
if COORD=HINT, follow card sequence U
if COORD=CART, follow card sequence C
if COORD=ZMT, follow card sequence G
if COORD=ZMTMPC, follow card sequence M
Card sequence U is the only one which allows you to define
a completely general basis here in $DATA.
Recall that UNIT in $CONTRL determines the distance units.
1
$DATA
----------------------------------------------------------
-5U- Atom input. Only the symmetry unique atoms are
input, GAMESS will generate the symmetry equivalent atoms
according to the point group selected above.
if COORD=UNIQUE NAME, ZNUC, X, Y, Z
***************
NAME = 10 character atomic name, used only for printout.
Thus you can enter H or Hydrogen, or whatever.
ZNUC = nuclear charge. It is the nuclear charge which
actually defines the atom's identity.
X,Y,Z = Cartesian coordinates.
if COORD=HINT
*************
NAME,ZNUC,CONX,R,ALPHA,BETA,SIGN,POINT1,POINT2,POINT3
NAME = 10 character atomic name (used only for print out).
ZNUC = nuclear charge.
CONX = connection type, choose from
'LC' linear conn. 'CCPA' central conn.
'PCC' planar central conn. with polar atom
'NPCC' non-planar central conn. 'TCT' terminal conn.
'PTC' planar terminal conn. with torsion
R = connection distance.
ALPHA= first connection angle
BETA = second connection angle
SIGN = connection sign, '+' or '-'
POINT1, POINT2, POINT3 =
connection points, a serial number of a previously
input atom, or one of 4 standard points: O,I,J,K
(origin and unit points on axes of master frame).
defaults: POINT1='O', POINT2='I', POINT3='J'
ref- R.L. Hilderbrandt, J.Chem.Phys. 51, 1654 (1969).
You cannot understand HINT input without reading this.
Note that if ZNUC is negative, the internally stored
basis for ABS(ZNUC) is placed on this center, but the
calculation uses ZNUC=0 after this. This is useful
for basis set superposition error (BSSE) calculations.
----------------------------------------------------------
* * * If you gave $BASIS, continue entering cards -5U-
until all the unique atoms have been specified.
When you are done, enter a " $END " card.
* * * If you did not, enter cards -6U-, -7U-, -8U-.
1
$DATA
----------------------------------------------------------
-6U- GBASIS, NGAUSS, (SCALF(i),i=1,4)
GBASIS has exactly the same meaning as in $BASIS. You may
choose from MINI, MIDI, STO, N21, N31, N311, DZV, DH, BC,
TZV, MC, SBKJC, or HW. In addition, you may choose S, P,
D, F, G, or L to enter an explicit basis set. Here, L
means both an s and p shell with a shared exponent.
In addition, GBASIS may be defined as MCP, to indicate that
the current atom is represented by a model core potential.
MCP must be followed by the keyword READ to indicate that
the basis functions are read using the sequence -6U-, -7U-,
and -8U-, as presently there are no built in basis sets.
In addition, MCP implies that the parameters of the model
core potentials together with core basis functions are in
the input stream in a $MCP group.
NGAUSS is the number of Gaussians (N) in the Pople style
basis, or user input general basis. It has meaning only
for GBASIS=STO, N21, N31, or N311, and S,P,D,F,G, or L.
Up to four scale factors may be entered. If omitted,
standard values are used. They are not documented as
every GBASIS treats these differently. Read the source
code if you need to know more. They are seldom given.
----------------------------------------------------------
* * * If GBASIS is not S,P,D,F,G, or L, either add more
shells by repeating card -6U-, or go on to -8U-.
* * * If GBASIS=S,P,D,F,G, or L, enter NGAUSS cards -7U-.
----------------------------------------------------------
-7U- IG, ZETA, C1, C2
IG = a counter, IG takes values 1, 2, ..., NGAUSS.
ZETA = Gaussian exponent of the IG'th primitive.
C1 = Contraction coefficient for S,P,D,F,G shells,
and for the s function of L shells.
C2 = Contraction coefficient for the p in L shells.
----------------------------------------------------------
* * * For more shells on this atom, go back to card -6U-.
* * * If there are no more shells, go on to card -8U-.
----------------------------------------------------------
-8U- A blank card ends the basis set for this atom.
----------------------------------------------------------
Continue entering atoms with -5U- through -8U- until all
are given, then terminate the group with a " $END " card.
--- this is the end of card sequence U ---
1
$DATA
COORD=CART input:
----------------------------------------------------------
-5C- Atom input.
Cartesian coordinates for all atoms must be entered. They
may be arbitrarily rotated or translated, but must possess
the actual point group symmetry. GAMESS will reorient the
molecule into the 'master frame', and determine which
atoms are the unique ones. Thus, the final order of the
atoms may be different from what you enter here.
NAME, ZNUC, X, Y, Z
NAME = 10 character atomic name, used only for printout.
Thus you can enter H or Hydrogen, or whatever.
ZNUC = nuclear charge. It is the nuclear charge which
actually defines the atom's identity.
X,Y,Z = Cartesian coordinates.
----------------------------------------------------------
Continue entering atoms with card -5C- until all are
given, and then terminate the group with a " $END " card.
--- this is the end of card sequence C ---
1
$DATA
COORD=ZMT input: (GAUSSIAN style internals)
----------------------------------------------------------
-5G- ATOM
Only the name of the first atom is required.
See -8G- for a description of this information.
----------------------------------------------------------
-6G- ATOM i1 BLENGTH
Only a name and a bond distance is required for atom 2.
See -8G- for a description of this information.
----------------------------------------------------------
-7G- ATOM i1 BLENGTH i2 ALPHA
Only a name, distance, and angle are required for atom 3.
See -8G- for a description of this information.
----------------------------------------------------------
-8G- ATOM i1 BLENGTH i2 ALPHA i3 BETA i4
ATOM is the chemical symbol of this atom. It can be
followed by numbers, if desired, for example Si3.
The chemical symbol implies the nuclear charge.
i1 defines the connectivity of the following bond.
BLENGTH is the bond length "this atom-atom i1".
i2 defines the connectivity of the following angle.
ALPHA is the angle "this atom-atom i1-atom i2".
i3 defines the connectivity of the following angle.
BETA is either the dihedral angle "this atom-atom i1-
atom i2-atom i3", or perhaps a second bond
angle "this atom-atom i1-atom i3".
i4 defines the nature of BETA,
If BETA is a dihedral angle, i4=0 (default).
If BETA is a second bond angle, i4=+/-1.
(sign specifies one of two possible directions).
----------------------------------------------------------
o Repeat -8G- for atoms 4, 5, ...
o The use of ghost atoms is possible, by using X or BQ
for the chemical symbol. Ghost atoms preclude the
option of an automatic generation of $ZMAT.
o The connectivity i1, i2, i3 may be given as integers,
1, 2, 3, 4, 5,... or as strings which match one of
the ATOMs. In this case, numbers must be added to the
ATOM strings to ensure uniqueness!
1
$DATA
o In -6G- to -8G-, symbolic strings may be given in
place of numeric values for BLENGTH, ALPHA, and BETA.
The same string may be repeated, which is handy in
enforcing symmetry. If the string is preceeded by a
minus sign, the numeric value which will be used is
the opposite, of course. Any mixture of numeric data
and symbols may be given. If any strings were given
in -6G- to -8G-, you must provide cards -9G- and
-10G-, otherwise you may terminate the group now with
a " $END " card.
----------------------------------------------------------
-9G- A blank line terminates the Z-matrix section.
----------------------------------------------------------
-10G- STRING VALUE
STRING is a symbolic string used in the Z-matrix.
VALUE is the numeric value to substitute for that string.
----------------------------------------------------------
Continue entering -10G- until all STRINGs are defined.
Note that any blank card encountered while reading -10G-
will be ignored. GAMESS regards all STRINGs as variables
(constraints are sometimes applied in $STATPT). It is not
necessary to place constraints to preserve point group
symmetry, as GAMESS will never lower the symmetry from
that given at -2-. When you have given all STRINGs a
VALUE, terminate the group with a " $END " card.
--- this is the end of card sequence G ---
* * * *
The documentation for sequence G above and sequence M
below presumes you are reasonably familiar with the input
to GAUSSIAN or MOPAC. It is probably too terse to be
understood very well if you are unfamiliar with these. A
good tutorial on both styles of Z-matrix input can be
found in Tim Clark's book "A Handbook of Computational
Chemistry", published by John Wiley & Sons, 1985.
Both Z-matrix input styles must generate a molecule
which possesses the symmetry you requested at -2-. If
not, your job will be terminated automatically.
1
$DATA
COORD=ZMTMPC input: (MOPAC style internals)
----------------------------------------------------------
-5M- ATOM
Only the name of the first atom is required.
See -8M- for a description of this information.
----------------------------------------------------------
-6M- ATOM BLENGTH
Only a name and a bond distance is required for atom 2.
See -8M- for a description of this information.
----------------------------------------------------------
-7M- ATOM BLENGTH j1 ALPHA j2
Only a bond distance from atom 2, and an angle with repect
to atom 1 is required for atom 3. If you prefer to hook
atom 3 to atom 1, you must give connectivity as in -8M-.
See -8M- for a description of this information.
----------------------------------------------------------
-8M- ATOM BLENGTH j1 ALPHA j2 BETA j3 i1 i2 i3
ATOM, BLENGTH, ALPHA, BETA, i1, i2 and i3 are as described
at -8G-. However, BLENGTH, ALPHA, and BETA must be given
as numerical values only. In addition, BETA is always a
dihedral angle. i1, i2, i3 must be integers only.
The j1, j2 and j3 integers, used in MOPAC to signal
optimization of parameters, must be supplied but are
ignored here. You may give them as 0, for example.
----------------------------------------------------------
Continue entering atoms 3, 4, 5, ... with -8M- cards until
all are given, and then terminate the group by giving a
" $END " card.
--- this is the end of card sequence M ---
==========================================================
This is the end of $DATA!
If you have any doubt about what molecule and basis set
you are defining, or what order the atoms will be
generated in, simply execute an EXETYP=CHECK job to find
out!
1
$ZMAT
==========================================================
$ZMAT group (required if NZVAR is nonzero in $CONTRL)
This group lets you define the internal coordinates in
which the gradient geometry search is carried out. These
need not be the same as the internal coordinates used in
$DATA. The coordinates may be simple Z-matrix types,
delocalized coordinates, or natural internal coordinates.
You must input a total of M=3N-6 internal coordinates
(M=3N-5 for linear molecules). NZVAR in $CONTRL can be
less than M IF AND ONLY IF you are using linear bends. It
is also possible to input more than M coordinates if they
are used to form exactly M linear combinations for new
internals. These may be symmetry coordinates or natural
internal coordinates. If NZVAR > M, you must input IJS and
SIJ below to form M new coordinates. See DECOMP in $FORCE
for the only circumstance in which you may enter a larger
NZVAR without giving SIJ and IJS.
**** IZMAT defines simple internal coordinates ****
IZMAT is an array of integers defining each coordinate.
The general form for each internal coordinate is
code number,I,J,K,L,M,N
IZMAT =1 followed by two atom numbers. (I-J bond length)
=2 followed by three numbers. (I-J-K bond angle)
=3 followed by four numbers. (dihedral angle)
Torsion angle between planes I-J-K and J-K-L.
=4 followed by four atom numbers. (atom-plane)
Out-of-plane angle from bond I-J to plane J-K-L.
=5 followed by three numbers. (I-J-K linear bend)
Counts as 2 coordinates for the degenerate bend,
normally J is the center atom. See $LIBE.
=6 followed by five atom numbers. (dihedral angle)
Dihedral angle between planes I-J-K and K-L-M.
=7 followed by six atom numbers. (ghost torsion)
Let A be the midpoint between atoms I and J, and
B be the midpoint between atoms M and N. This
coordinate is the dihedral angle A-K-L-B. The
atoms I,J and/or M,N may be the same atom number.
(If I=J AND M=N, this is a conventional torsion).
Examples: N2H4, or, with one common pair, H2POH.
Example - a nonlinear triatomic, atom 2 in the middle:
$ZMAT IZMAT(1)=1,1,2, 2,1,2,3, 1,2,3 $END
This sets up two bonds and the angle between them.
The blanks between each coordinate definition are
not necessary, but improve readability mightily.
1
$ZMAT
**** the next define delocalized coordinates ****
DLC is a flag to request delocalized coordinates.
(default is .FALSE.)
AUTO is a flag to generate all redundant coordinates,
automatically. The DLC space will consist of all
non-redundant combinations of these which can be
found. The list of redundant coordinates will
consist of bonds, angles, and torsions only.
(default is .FALSE.)
NONVDW is an array of atom pairs which are to be joined
by a bond, but might be skipped by the routine
that automatically includes all distances shorter
than the sum of van der Waals radii. Any angles
and torsions associated with the new bond(s) are
also automatically included.
The format for IXZMAT, IRZMAT, IFZMAT is that of IZMAT:
IXZMAT is an extra array of simple internal coordinates
which you want to have added to the list generated
by AUTO. Unlike NONVDW, IXZMAT will add only the
coordinate(s) you specify.
IRZMAT is an array of simple internal coordinates which
you would like to remove from the AUTO list of
redundant coordinates. It is sometimes necessary
to remove a torsion if other torsions around a bond
are being frozen, to obtain a nonsingular G matrix.
IFZMAT is an array of simple internal coordinates which
you would like to freeze. See also FVALUE below.
Note that IFZMAT/FVALUE work only with DLC, see the
IFREEZ option in $STATPT to freeze coordinates if
you wish to freeze simple or natural coordinates.
FVALUE is an array of values to which the internal
coordinates should be constrained. It is not
necessary to input $DATA such that the initial
values match these desired final values, but it is
helpful if the initial values are not too far away.
1
$ZMAT $LIBE
**** SIJ,IJS define natural internal coordinates ****
SIJ is a transformation matrix of dimension NZVAR x M,
used to transform the NZVAR internal coordinates in
IZMAT into M new internal coordinates. SIJ is a
sparse matrix, so only the non-zero elements are
given, by using the IJS array described below.
The columns of SIJ will be normalized by GAMESS.
(Default: SIJ = I, unit matrix)
IJS is an array of pairs of indices, giving the row and
column index of the entries in SIJ.
example - if the above triatomic is water, using
IJS(1) = 1,1, 3,1, 1,2, 3,2, 2,3
SIJ(1) = 1.0, 1.0, 1.0,-1.0, 1.0
gives the matrix S= 1.0 1.0 0.0
0.0 0.0 1.0
1.0 -1.0 0.0
which defines the symmetric stretch, asymmetric stretch,
and bend of water.
references for natural internal coordinates:
P.Pulay, G.Fogarasi, F.Pang, J.E.Boggs
J.Am.Chem.Soc. 101, 2550-2560(1979)
G.Fogarasi, X.Zhou, P.W.Taylor, P.Pulay
J.Am.Chem.Soc. 114, 8191-8201(1992)
reference for delocalized coordinates:
J.Baker, A. Kessi, B.Delley
J.Chem.Phys. 105, 192-212(1996)
==========================================================
$LIBE group (required if linear bends are used in $ZMAT)
A degenerate linear bend occurs in two orthogonal planes,
which are specified with the help of a point A. The first
bend occurs in a plane containing the atoms I,J,K and the
user input point A. The second bend is in the plane
perpendicular to this, and containing I,J,K. One such
point must be given for each pair of bends used.
APTS(1)= x1,y1,z1,x2,y2,z2,... for linear bends 1,2,...
Note that each linear bend serves as two coordinates, so
that if you enter 2 linear bends (HCCH, for example), the
correct value of NZVAR is M-2, where M=3N-6 or 3N-5, as
appropriate.
==========================================================
1
$SCF
==========================================================
$SCF group relevant if SCFTYP = RHF, UHF, or ROHF,
required if SCFTYP = GVB)
This group of parameters provides additional control
over the RHF, UHF, ROHF, or GVB SCF steps. It must be
given for GVB open shell or perfect pairing wavefunctions.
DIRSCF = a flag to activate a direct SCF calculation,
which is implemented for all the Hartree-Fock
type wavefunctions: RHF, ROHF, UHF, and GVB.
This keyword also selects direct MP2 computation.
The default of .FALSE. stores integrals on disk
storage for a conventional SCF calculation.
FDIFF = a flag to compute only the change in the Fock
matrices since the previous iteration, rather
than recomputing all two electron contributions.
This saves much CPU time in the later iterations.
This pertains only to direct SCF, and has a
default of .TRUE. This option is implemented
only for the RHF, ROHF, UHF cases.
Cases with many diffuse functions in the basis
set sometimes oscillate at the end, rather than
converging. Turning this parameter off will
normally give convergence.
---- The next flags affect convergence rates.
NOCONV = .TRUE. means neither SOSCF nor DIIS will be used.
The default is .FALSE., making the choice of the
primary converger as follows:
for RHF, GVB, or Abelian group ROHF, use SOSCF.
for any DFT, UHF, or non-Abelian ROHF, use DIIS.
DIIS = selects Pulay's DIIS interpolation.
SOSCF = selects second order SCF orbital optimization.
Once either DIIS or SOSCF are initiated, the following
less important accelerators are put in abeyance:
EXTRAP = selects Pople extrapolation of the Fock matrix.
DAMP = selects Davidson damping of the Fock matrix.
SHIFT = selects level shifting of the Fock matrix.
RSTRCT = selects restriction of orbital interchanges.
DEM = selects direct energy minimization, which is
implemented only for RHF. (default=.FALSE.)
defaults for EXTRAP DAMP SHIFT RSTRCT DIIS SOSCF
ab initio: T F F F F/T T/F
semiempirical: T F F F F F
The above parameters are implemented for all SCF
wavefunction types, except that DIIS will work for GVB
only for those cases with NPAIR=0 or NPAIR=1.
1
$SCF
---- These parameters fine tune the various convergers.
CONV = SCF density convergence criteria.
Convergence is reached when the density change
between two consecutive SCF cycles is less than
this in absolute value. One more cycle will be
executed after reaching convergence. Less
accuracy in CONV gives questionable gradients.
The default is 1.0d-05, except runs involving
CI or MP2 gradients or CC energies use 1.0d-06.
SOGTOL = second order gradient tolerance. SOSCF will be
initiated when the orbital gradient falls below
this threshold. (default=0.25 au)
ETHRSH = energy error threshold for initiating DIIS. The
DIIS error is the largest element of e=FDS-SDF.
Increasing ETHRSH forces DIIS on sooner.
(default = 0.5 Hartree)
MAXDII = Maximum size of the DIIS linear equations, so
that at most MAXDII-1 Fock matrices are used
in the interpolation. (default=10)
DEMCUT = Direct energy minimization will not be done
once the density matrix change falls below
this threshold. (Default=0.5)
DMPCUT = Damping factor lower bound cutoff. The damping
damping factor will not be allowed to drop
below this value. (default=0.0)
note: The damping factor need not be zero to achieve
valid convergence (see Hsu, Davidson, and
Pitzer, J.Chem.Phys., 65, 609 (1976), see
especially the section on convergence control),
but it should not be astronomical either.
* * * * * * * * * * * * * * * * * * * * *
For more info on the convergence methods,
see the 'Further Information' section.
* * * * * * * * * * * * * * * * * * * * *
----- miscellaneous options -----
NPUNCH = SCF punch option
= 0 do not punch out the final orbitals
= 1 punch out the occupied orbitals
= 2 punch out occupied and virtual orbitals
The default is NPUNCH = 2.
UHFNOS = flag controlling generation of the natural
orbitals of a UHF function. (default=.FALSE.)
1
$SCF
MVOQ = 0 Skip MVO generation (default)
= n Form modified virtual orbitals, using a cation
with n electrons removed. Implemented for
RHF, ROHF, and GVB. If necessary to reach a
closed shell cation, the program might remove
n+1 electrons. Typically, n will be about 6.
= -1 The cation used will have each valence orbital
half filled, to produce MVOs with valence-like
character in all regions of the molecule.
Implemented for RHF and ROHF only.
ACAVO = Flag to request Approximate Correlation-Adapted
Virtual Orbitals. Implemented for RHF, ROHF,
and GVB. The default is .FALSE.
PACAVO = Parameters used to define the ACAVO generating
operator, which is the operator
a*T + b*Vne + c*Jcore + d*Jval + e*Kcore + f*Kval
The default corresponds to Whitten orbitals,
J.L.Whitten, J.Chem.Phys. 56, 458-546(1972)
which maximize the exchange interaction with
the valence orbitals, PACOVO(1)=0,0,0,0,0,-1.0.
A better set of parameters, in terms of possibly
producing a lower CI-SD energy, is PACAVO(1)=
0.02,0.02,0.0,0.10,0.0,-1.0
----- options for virial scaling -----
VTSCAL = A flag to request that the virial theorem be
satisfied. An analysis of the total energy
as an exact sum of orbital kinetic energies
is printed. The default is .FALSE.
This option is implemented for RHF, UHF, and ROHF,
for RUNTYP=ENERGY, OPTIMIZE, or SADPOINT. Related
input is as follows:
SCALF = initial exponent scale factor when VTSCAL is
in use, useful when restarting. The default
is 1.0.
MAXVT = maximum number of iterations (at a single
geometry) to satisfy the energy virial theorem.
The default is 20.
VTCONV = convergence criterion for the VT, which is
satisfied when 2 + + R x dE/dR is less
than VTCONV. The default is 1.0D-6 Hartree.
For more information on this option, which is most
economically employed during a geometry search, see
M.Lehd and F.Jensen, J.Comput.Chem. 12, 1089-1096(1991).
1
$SCF
The next parameters define the GVB wavefunction. Note
that ALPHA and BETA also have meaning for ROHF. See also
MULT in the $CONTRL group. The GVB wavefunction assumes
orbitals are in the order core, open, pairs.
NCO = The number of closed shell orbitals. The
default almost certainly should be changed!
(default=0).
NSETO = The number of sets of open shells in the
function. Maximum of 10. (default=0)
NO = An array giving the degeneracy of each open
shell set. Give NSETO values.
(default=0,0,0,...).
NPAIR = The number of geminal pairs in the -GVB-
function. Maximum of 12. The default
corresponds to open shell SCF (default=0).
CICOEF = An array of ordered pairs of CI coefficients
for the -GVB- pairs. For example, a two pair
case for water, say, might be
CICOEF(1)=0.95,-0.05,0.95,-0.05. If not
normalized, as in the default, they will be.
This parameter is useful in restarting a GVB
run, with the current CI coefficients.
(default = 0.90,-0.20,0.90,-0.20,...)
COUPLE = A switch controlling the input of F, ALPHA,
and BETA. The default is to use internally
stored values for these variables. Note
ALPHA and BETA can be given for -ROHF-, as
well as -GVB-. (Default=.FALSE.)
F = An vector of fractional occupations.
ALPHA = An array of A coupling coefficients given in
lower triangular order.
BETA = An array of B coupling coefficients given in
lower triangular order.
Note: The default for F, ALPHA, and BETA depends on
the state chosen. Defaults for the most commonly occuring
cases are internally stored.
* * * * * * * * * * * * * * * * * * *
For more discussion of GVB/ROHF input
see the 'further information' section
* * * * * * * * * * * * * * * * * * *
==========================================================
1
$SCFMI
==========================================================
$SCFMI group (optional, relevant if SCFTYP=RHF)
The SCF-MI method is a modification of the Roothaan
equations that avoids basis set superposition error (BSSE)
in intermolecular interaction calculations, by expanding
each monomer's orbitals using only its own basis set.
Thus, the resulting orbitals are not orthogonal. The
presence of a $SCFMI group in the input triggers the use
of this option.
The implementation is limited to two monomers, treated
at the RHF level. The energy, gradient, and therefore
numerical hessian are available. The SCF step may be run
in direct SCF mode. The first 4 parameters must be given.
All atoms of monomer A must be given in $DATA before the
atoms of monomer B.
NA = number of doubly occupied MOs on fragment A.
NB = number of doubly occupied MOs on fragment B.
MA = number of basis functions on fragment A.
MB = number of basis functions on fragment B.
ITER = maximum number of SCF-MI cycles, overriding
the usual MAXIT value. (default is 50).
DTOL = SCF-MI density convergence criteria.
(default is 1.0d-10)
ALPHA = possible level shift parameter.
(default is 0.0, meaning shifting is not used)
IOPT = prints additional debug information.
= 0 standard outout (default)
= 1 print for each SCF-MI cycle MOs, overlap
between the MOs, CPU times.
= 2 print some extra informations in secular
systems solution.
MSHIFT = debugging option that permits to shift all
the memory pointer of the SCF-MI section
of code of the quantity MSHIFT (default is 0).
==========================================================
"Modification of Roothan Equations to Exclude BSSE
from Molecular Interaction Calculations"
E. Gianinetti, M. Raimondi, E. Tornaghi
Int. J. Quantum Chem. 60, 157 (1996)
A. Famulari, E. Gianinetti, M. Raimondi, and M. Sironi
Int. J. Quantum Chem. (1997), submitted.
1
$DFT
==========================================================
$DFT group (relevant if SCFTYP=RHF,UHF,ROHF)
Note that if DFTTYP=NONE, an ab initio calculation
will be performed, rather than density functional theory.
This group permits the use of various one electron
(usually empirical) operators instead of the true many
electron Hamiltonian. Two programs are provided, METHOD=
GRID or GRIDFREE. The programs have different functionals
available, and so the keyword DFTTYP and other associated
inputs are documented separately below. Every functional
that has the same name in both lists is the identical
functional, but each METHOD has a few functionals that are
missing in the other.
The grid free implementation is based on the use of
the resolution of the identity to simplify integrals so
that they may be analytically evaluated, without using
grid quadratures. The grid free DFT computations in their
present form have various numerical errors, primarily in
the gradient vectors. Please do not use the grid-free DFT
program without reading the discussion in the 'Further
References' section regarding the gradient accuracy.
The grid based DFT uses a typical grid quadrature to
compute integrals over the rather complicated functionals.
Achieving a self-consistent field with DFT is rather
more difficult than for normal HF, so DIIS is the default
converger. The use of GUESS=MOREAD to input HF orbitals is
very helpful in facilitating DFT convergence, and at the
least, saves considerable time in doing DFT iterations.
Both DFT programs will run in parallel.
1
$DFT
DFTTYP = NONE means no DFT is performed (default)
METHOD = selects grid based DFT or grid free DFT.
= GRID Grid based DFT (default)
= GRIDFREE Grid free DFT
----- options for METHOD=GRID -----
DFTTYP = specifies exchange and correlation functionals.
pure exchange functionals (no correlation):
= SLATER Slater exchange
= BECKE Becke 1988 exchange
= GILL Gill 1996 exchange
= PBE Perdew-Burke-Ernzerhof (PBE) exchange
Note that the PBE correlation functional
is not implemented.
pure correlation functionals (HF exchange):
= VWN Vosko-Wilk-Nusair correlation, using
their electron gas formula 5 (VWN5)
= LYP Lee-Yang-Parr correlation
= OP One-parameter Progressive correlation
combination functionals:
= SVWN SLATER exchange + VWN5 correlation
Called LDA/LSDA by physicists for RHF/UHF.
= SLYP SLATER exchange + LYP correlation
= SOP SLATER exchange + OP correlation
= BVWN BECKE exchange + VWN5 correlation
= BLYP BECKE exchange + LYP correlation
= BOP BECKE exchange + OP correlation
= GVWN GILL exchange + VWN5 correlation
= GLYP GILL exchange + LYP correlation
= GOP GILL exchange + OP correlation
= PBEVWN PBE exchange + VWN5 correlation
= PBELYP PBE exchange + LYP correlation
= PBEOP PBE exchange + OP correlation
hybrid functionals:
= BHHLYP HF and BECKE exchange + LYP correlation
= B3LYP this is a hybrid method combining five
functionals, namely Becke + Slater + HF
exchange and LYP + VWN5 correlation.
An extensive bibliography for these functionals can be
found in the 'Further References' section of this manual.
1
$DFT
NRAD = number of radial grids in Euler-Maclaurin
quadrature. (default=96)
NTHE = number of angle theta grids in Gauss-Legendre
quadrature. (default=12)
NPHI = number of angle phi grids in Gauss-Legendre
quadrature. NPHI should be double NTHE so that
points are spherically distributed. (default=24)
NRAD*NTHE*NPHI grid points will be constructed around each
atom. Time is linear in the number of grid points, so be
careful. Energies can be compared only when the identical
grid density has been used, analogous to needing to compare
with the identical basis set expansions. A very accurate
"army grade" grid capable of producing an integration error
less than a microHartree/atom is NRAD=96 NTHE=36 NPHI=72.
The default grid has an error probably no worse than about
20 microHartree/atom, depending on the type of atom.
NRAD0, NTHE0, NPHI0 define a smaller grid used during the
SCF iterations before some initial convergence is reached.
After that, the full grid defined by NRAD, NTHE, NPHI will
be used. This can save considerable CPU time in the early
SCF iterations.
SWITCH = when the change in the density matrix between
iterations falls below this threshhold, switch
to use of the desired full grid (default=3.0E-4)
NRAD0 = same as NRAD, but defines initial (smaller) grid.
NTHE0 = same as NTHE, but defines initial (smaller) grid.
NPHI0 = same as NPHI, but defines initial (smaller) grid.
Default values for the initial grid depend upon NRAD, NTHE,
and NPHI. For the default full grid settings, the initial
grid is NRAD0=24, NTHE0=8, NPHI0=16, for other values the
formula is NRAD0 the larger of NRAD/4 or 24, for NTHE0 the
larger of NTHE/3 or 8, and for NPHI0 the larger of NPHI/3
or 16. In case of slow convergence of the SCF or if using
the "army grade grid", NRAD0=48 NTHE0=12 NPHI0=24 and
SWITCH=1.0E-4 may be better. Numerical hessian runs set
the coarse grid to the same size as the full grid, by
default.
THRESH = threshold for ignoring small contributions to the
Fock matrix. The default is designed to produce
no significant energy loss, even when the grid is
as good as "army grade". If for some reason you
want to turn all threshhold tests off, of course
requiring more CPU, enter 1.0e-15.
default: 1.0e-4/Natoms/NRAD/NTHE/NPHI
1
$DFT
----- options for METHOD=GRIDFREE -----
DFTTYP = NONE means ab initio computation (default)
exchange functionals:
= XALPHA X-Alpha exchange (alpha=0.7)
= SLATER Slater exchange (alpha=2/3)
= BECKE Becke's 1988 exchange
= DEPRISTO Depristo/Kress exchange
= CAMA Handy et al's mods to Becke exchange
= HALF 50-50 mix of Becke and HF exchange
correlation functionals:
= VWN Vosko/Wilke/Nusair correlation, formula 5
= PWLOC Perdew/Wang local correlation
= LYP Lee/Yang/Parr correlation
exchange/correlation functionals:
= BVWN Becke exchange + VWN5 correlation
= BLYP Becke exchange + LYP correlation
= BPWLOC Becke exchange + Perdew/Wang correlation
= B3LYP hybridized HF/Becke/LYP using VWN formula 5
= CAMB CAMA exchange + Cambridge correlation
= XVWN Xalpha exchange + VWN5 correlation
= XPWLOC Xalpha exchange + Perdew/Wang correlation
= SVWN Slater exchange + VWN5 correlation
= SPWLOC Slater exchange + PWLOC correlation
= WIGNER Wigner exchange + correlation
= WS Wigner scaled exchange + correlation
= WIGEXP Wigner exponential exchange + correlation
AUXFUN = AUX0 uses no auxiliary basis set for resolution
of the identity, limiting accuracy.
= AUX3 uses the 3rd generation of RI basis sets,
These are available for the elements H to
Ar, but have been carefully considered for
H-Ne only. (DEFAULT)
THREE = a flag to use a resolution of the identity to
turn four center overlap integrals into three
center integrals. This can be used only if
no auxiliary basis is employed. (default=.FALSE.)
==========================================================
1
$MP2
==========================================================
$MP2 group (relevant to SCFTYP=RHF,UHF,ROHF if MPLEVL=2)
Controls 2nd order Moller-Plesset perturbation runs,
if requested by MPLEVL in $CONTRL. See also the DIRSCF
keyword in $SCF to select direct MP2. MP2 is implemented
for RHF, high spin ROHF, or UHF wavefunctions, but see also
$MCQDPT for MCSCF. Analytic gradients and the first order
correction to the wavefunction (i.e. properties) are only
available for RHF and UHF. The $MP2 group is not usually
given.
NACORE = n Omits the first n occupied orbitals from the
calculation. The default for n is the number
of chemical core orbitals.
NBCORE = Same as NACORE, for the beta orbitals of UHF.
It is almost always the same value as NACORE.
MP2PRP= a flag to turn on property computation for RHF
or UHF MP2 jobs with RUNTYP=ENERGY. This is
appreciably more expensive than just evaluating
the 2nd order energy correction alone, so the
default is .FALSE. Properties are always
computed during gradient runs, when they are
an almost free byproduct. (default=.FALSE.)
LMOMP2= a flag to analyze the closed shell MP2 energy
in terms of localized orbitals. Any type of
localized orbital may be used. This option
is implemented only for RHF, and its selection
forces use of the METHOD=3 transformation.
The default is .FALSE.
OSPT= selects open shell spin-restricted perturbation.
This parameter applies only when SCFTYP=ROHF.
Please see the 'further information' section for
more information about this choice.
= ZAPT picks Z-averaged perturbation theory. (default)
= RMP picks RMP (aka ROHF-MBPT) perturbation theory.
CUTOFF= transformed integral retention threshold, the
default is 1.0d-9.
1
$MP2
CPHFBS = BASISMO solves the response equations during
gradient computations in the MO basis. This
is programmed only for RHF references without
frozen core orbitals, when it is the default.
= BASISAO solves the response equations using
AO integrals, for frozen core MP2 with a RHF
reference, or for any UHF based MP2.
The last 3 input variables apply to any serial MP2 run,
or to parallel ROHF+MP2 runs using OSPT=RMP.
NWORD = controls memory usage. The default uses all
available memory. (default=0)
METHOD= n selects transformation method, 2 being the
segmented transformation, and 3 being a more
conventional two phase bin sort implementation.
3 requires more disk, but less memory. The
default is to attempt method 2 first, and
method 3 second.
AOINTS= defines AO integral storage during conventional
integral transformations, during parallel runs.
DUP stores duplicated AO lists on each node, and
is the default for parallel computers with slow
interprocessor communication, e.g. ethernet.
DIST distributes the AO integral file across all
nodes, and is the default for parallel
computers with high speed communications.
==========================================================
1
$CIS
==========================================================
$CIS group Required when CITYP=CIS
The CIS method (singly excited CI) is the simplest way
to treat excited states. By Brillouin's Theorem, a single
determinant reference such as RHF will have zero matrix
elements with singly substituted determinants. The ground
state reference therefore has no mixing with the excited
states treated with singles only. Reading the references
given in Section 4 of this manual will show the CIS method
can be thought of as a non-correlated method, rigorously
so for the ground state, and effectively so for the various
excited states. Some issues making CIS rather less than a
black box method are:
a) any states characterized by important doubles are
simply missing from the calculation.
b) excited states commonly possess Rydberg (diffuse)
character, so the AO basis used must allow this.
c) excited states often have different point group
symmetry than the ground state, so the starting
geometries for these states must reflect their
actual symmetry.
d) excited state surfaces frequently cross, and thus
root flipping may very well occur.
The implementation allows the use of only RHF references,
but can pick up both singlet and triplet excited states.
Nuclear gradients are available, as are properties.
NACORE = n Omits the first n occupied orbitals from the
calculation. The default for n is the number
of chemical core orbitals.
NSTATE = Number of states to be found (excluding the
ground state).
ISTATE = State for which properties and/or gradient will
be calculated. Only one state can be chosen.
HAMTYP = Type of CI Hamiltonian to use.
= SAPS spin-adapted antisymmetrized product of
the desired MULT will be used (default)
= DETS determinant based, so both singlets and
triplets will be obtained.
MULT = Multiplicity (1 or 3) of the singly excited
SAPS (the reference is necessarily single RHF).
Only relevant for SAPS based run.
DIAGZN = Hamiltonian diagonalization method.
= DAVID use Davidson diagonalization. (default)
= FULL construct the full matrix in memory and
diagonalize, thus determining all states
(not recommended except for small cases).
1
$CIS $CISVEC
DGAPRX = Flag to control whether approximate diagonal
elements of the CIS Hamiltonian (based only on
the orbital energies) are used in the Davidson
algorithm. Note, this only affects the rate of
convergence, not the resulting final energies.
If set .FALSE., the exact diagonal elements are
determined and used. Default=.TRUE.
NGSVEC = Dimension of the Hamiltonian submatrix that is
diagonalized to form the initial CI vectors.
The default is the greater of NSTATE*2 and 10.
MXVEC = Maximum number of expansion basis vectors in the
iterative subspace during Davidson iterations,
before the expansion basis is truncated. The
default is the larger of 8*NSTATE and NGSVEC.
NDAVIT = Maximum number of Davidson iterations. Default=50.
DAVCVG = Convergence criterion for Davidson eigenvectors.
Eigenvector accuracy is proportional to DAVCVG,
while the energy accuracy is proportional to its
square. The default is 1.0E-05.
CISPRP = Flag to request the determination of CIS level
properties, using the relaxed density. Relevant
to RUNTYP=ENERGY jobs, although the default is
.FALSE. because additional CPHF calculation will
be required. Properties are computed as a normal
byproduct of runs involving the CIS gradient.
CHFSLV = Chooses type of CPHF solver to use.
= CONJG selects an ordinary preconditioned conjugate
gradient solver. This is the default.
= DIIS selects a diis-like iterative solver.
RDCISV = Flag to read CIS vectors from a $CISVEC group
in the input file. Default is .FALSE.
MNMEDG = Flag to force the use of the minimal amount of
memory in construction of the CIS Hamiltonian
diagonal elements. This is only relevant when
DGAPRX=.FALSE., and is meant for debug purposes.
The default is .FALSE.
MNMEOP = Flag to force the use of the minimal amount of
memory during the Davidson iterations. This is
for debug purposes. The default is .FALSE.
==========================================================
$CISVEC group required if RDCISV in $CIS is chosen
This is formatted data generated by a previous CIS run, to
be read back in as starting vectors. Sometimes molecular
orbital phase changes make these CI vectors problematic.
==========================================================
1
$CCINP
==========================================================
$CCINP group (optional, relevant for any CCTYP)
This group controls a coupled-cluster calculation of
the type specified by CCTYP in $CONTRL. If omitted, all
valence electrons will be correlated. See the "Further
Information" section of this manual for more details.
NCORE = gives the number of frozen core orbitals to be
omitted from the CC calculation. The default
is the number of chemical core orbitals.
NFZV = the number of frozen virtual orbitals to be
omitted from the calculation. The default is 0.
MAXCC = defines the maximum number of CCSD (or LCCD, CCD)
iterations. The default is 30.
ICONV = defines the convergence criterion for the cluster
amplitudes. CC iterations are converged when the
maximum change in amplitudes is less than
10**(-ICONV). The default is 7.
NWORD = a limit on memory to be used in the CC steps.
The default is 0, meaning all memory available
will be used.
IREST = defines the restart option. If the value of IREST
is greater or equal 3, program will restart from
the earlier CC run. This requires saving the disk
file CCREST from the previous CC run. Values of
IREST between 0 and 3 should not be used. In
general, the value of IREST is used by the program
to set the iteration counter in the restarted run.
The default is 0, meaning no restart is attempted.
MXDIIS = defines the number of cluster amplitude vectors
from previous iterations to be included in the
DIIS extrapolation during the CCSD (or LCCD, CCD)
iterative process. The default value of MXDIIS is
5 for all but small problems. The DIIS solver can
be disengaged by entering MXDIIS = 0. It is not
necessary to change the default value of MXDIIS,
unless the CC equations do not converge in spite
of increasing the value of MAXCC.
AMPTSH = defines a threshold for eliminating small cluster
amplitudes from the CC calculations. Amplitudes
with absolute values smaller than AMPTSH are set
to zero. The default is to retain all small
amplitudes, meaning fully accurate CC iterations.
Default = 0.0.
==========================================================
1
$GUESS
==========================================================
$GUESS group (optional, relevant for all SCFTYP's)
This group controls the selection of initial molecular
orbitals.
GUESS = Selects type of initial orbital guess.
= HUCKEL Carry out an extended Huckel calculation
using a Huzinaga MINI basis set, and
project this onto the current basis.
This is implemented for atoms up to Rn,
and will work for any all electron or
ECP basis set. (default for most runs)
= HCORE Diagonalize the one electron Hamiltonian
to obtain the initial guess orbitals.
This method is applicable to any basis
set, but does not work as well as the
HUCKEL guess.
= MOREAD Read in formatted vectors punched by an
earlier run. This requires a $VEC group,
and you MUST pay attention to NORB below.
= RDMINI Read in a $VEC group from a converged
calculation that used GBASIS=MINI and no
polarization functions, and project these
orbitals onto the current basis. Do not
use this option if the current basis
involve ECP basis sets.
= MOSAVED (default for restarts) The initial
orbitals are read from the DICTNRY file
of the earlier run.
= SKIP Bypass initial orbital selection. The
initial orbitals and density matrix are
assumed to be in the DICTNRY file. Mostly
used for RUNTYP=HESSIAN when the hessian
is being read in from the input.
All GUESS types except 'SKIP' permit reordering of the
orbitals, carry out an orthonormalization of the orbitals,
and generate the correct initial density matrix, for RHF,
UHF, ROHF, and GVB, but note that correct computation of
the GVB density requires also CICOEF in $SCF. The density
matrix cannot be generated from the orbitals alone for MP2,
CI, or MCSCF, so property evaluation for these should be
RUNTYP=ENERGY rather than RUNTYP=PROP using GUESS=MOREAD.
PRTMO = a flag to control printing of the initial guess.
(default=.FALSE.)
PUNMO = a flag to control punching of the initial guess.
(default=.FALSE.)
1
$GUESS
MIX = rotate the alpha and beta HOMO and LUMO orbitals
so as to generate inequivalent alpha and beta
orbital spaces. This pertains to UHF singlets
only. This may require use of NOSYM=1 in $CONTRL
depending on your situation. (default=.FALSE.)
NORB = The number of orbitals to be read in the $VEC
group. This applies only to GUESS=MOREAD.
For -RHF-, -UHF-, -ROHF-, and -GVB-, NORB defaults to the
number of occupied orbitals. NORB must be given for -CI-
and -MCSCF-. For -UHF-, if NORB is not given, only the
occupied alpha and beta orbitals should be given, back to
back. Otherwise, both alpha and beta orbitals must
consist of NORB vectors.
NORB may be larger than the number of occupied MOs, if you
wish to read in the virtual orbitals. If NORB is less
than the number of atomic orbitals, the remaining orbitals
are generated as the orthogonal complement to those read.
NORDER = Orbital reordering switch.
= 0 No reordering (default)
= 1 Reorder according to IORDER and JORDER.
IORDER = Reordering instructions.
Input to this array gives the new molecular
orbital order. For example, IORDER(3)=4,3 will
interchange orbitals 3 and 4, while leaving the
other MOs in the original order. This parameter
applies to all orbitals (alpha and beta) except
for -UHF-, where it only affects the alpha MOs.
(default is IORDER(i)=i )
JORDER = Reordering instructions.
Same as IORDER, but for the beta MOs of -UHF-.
INSORB = the first INSORB orbitals specified in the $VEC
group will be inserted into the Huckel guess,
making the guess a hybrid of HUCKEL/MOREAD. This
keyword is meaningful only when GUESS=HUCKEL, and
it is useful mainly for QM/MM runs where some
orbitals (buffer) are frozen and need to be
transferred to the initial guess vector set,
see $MOFRZ. (default=0)
1
$GUESS
* * * the next are 3 ways to clean up orbitals * * *
PURIFY = flag to symmetrize starting orbitals. This is the
most soundly based of the possible procedures.
However it may fail in complicated groups when the
orbitals are very unsymmetric. (default=.FALSE.)
TOLZ = level below which MO coefficients will be set
to zero. (default=1.0E-7)
TOLE = level at which MO coefficients will be equated.
This is a relative level, coefficients are set
equal if one agrees in magnitude to TOLE times
the other. (default=5.0E-5)
SYMDEN = project the initial density in order to generate
symmetric orbitals. This may be useful if the
HUCKEL or HCORE guess types give orbitals of
impure symmetry (?'s present). The procedure
will generate a fairly high starting energy, and
thus its use may not be a good idea for orbitals
of the quality of MOREAD. (default=.FALSE.)
==========================================================
1
$VEC
==========================================================
$VEC group (optional, relevant for all SCFTYP's)
(required if GUESS=MOREAD)
This group consists of formatted vectors, as written
onto file PUNCH in a previous run. It is considered good
form to retain the titling comment cards punched before
the $VEC card, as a reminder to yourself of the origin of
the orbitals.
For Morokuma decompositions, the names of this group
are $VEC1, $VEC2, ... for each monomer, computed in the
identical orientation as the supermolecule. For transition
moment or spin-orbit coupling runs, orbitals for states
one and possibly two are $VEC1 and $VEC2.
==========================================================
$MOFRZ group (optional, relevant for RHF, ROHF, GVB)
This group controls freezing the molecular orbitals
of your choice during the SCF procedure. If you choose
this option, select DIIS in $SCF since SOSCF will not
converge as well. GUESS=MOREAD is required in $GUESS.
FRZ = flag which triggers MO freezing. (default=.FALSE.)
IFRZ = an array of MOs in the input $VEC set which are
to be frozen. There is no default for this.
==========================================================
1
$STATPT
==========================================================
$STATPT group (optional, for RUNTYP=OPTIMIZE or SADPOINT)
This group controls the search for stationary points.
Note that NZVAR in $CONTRL determines if the geometry
search is conducted in Cartesian or internal coordinates.
METHOD = optimization algorithm selection. Pick from
NR Straight Newton-Raphson iterate. This will
attempt to locate the nearest stationary
point, which may be of any order. There
is no steplength control. RUNTYP can be
either OPTIMIZE or SADPOINT
RFO Rational Function Optimization. This is
one of the augmented Hessian techniques
where the shift parameter(s) is(are) chosen
by a rational function approximation to
the PES. For SADPOINT searches it involves
two shift parameters. If the calculated
stepsize is larger than DXMAX the step is
simply scaled down to size.
QA Quadratic Approximation. This is another
version of an augmented Hessian technique
where the shift parameter is chosen such
that the steplength is equal to DXMAX.
It is completely equivalent to the TRIM
method. (default)
SCHLEGEL The quasi-NR optimizer by Schlegel.
CONOPT, CONstrained OPTimization. An algorithm
which can be used for locating TSs.
The starting geometry MUST be a minimum!
The algorithm tries to push the geometry
uphill along a chosen Hessian mode (IFOLOW)
by a series of optimizations on hyperspheres
of increasingly larger radii.
Note that there currently are no restart
capabilitites for this method, not even
manually.
OPTTOL = gradient convergence tolerance, in Hartree/Bohr.
Convergence of a geometry search requires the
largest component of the gradient to be less
than OPTTOL, and the root mean square gradient
less than 1/3 of OPTTOL. (default=0.0001)
NSTEP = maximum number of steps to take. Restart data
is punched if NSTEP is exceeded. (default=20)
1
$STATPT
--- the next four control the step size ---
DXMAX = initial trust radius of the step, in Bohr.
For METHOD=RFO, QA, or SCHLEGEL, steps will
be scaled down to this value, if necessary.
(default=0.3 for OPTIMIZE and 0.2 for SADPOINT)
For METHOD=NR, DXMAX is inoperative.
For METHOD=CONOPT, DXMAX is the step along the
previous two points to increment the hypersphere
radius between constrained optimizations.
(default=0.1)
the next three apply only to METHOD=RFO or QA:
TRUPD = a flag to allow the trust radius to change as
the geometry search proceeds. (default=.TRUE.)
TRMAX = maximum permissible value of the trust radius.
(default=0.5 for OPTIMIZE and 0.3 for SADPOINT)
TRMIN = minimum permissible value of the trust radius.
(default=0.05)
--- the next three control mode following ---
IFOLOW = Mode selection switch, for RUNTYP=SADPOINT.
For METHOD=RFO or QA, the mode along which the
energy is maximized, other modes are minimized.
Usually refered to as "eigenvector following".
For METHOD=SCHLEGEL, the mode whose eigenvalue
is (or will be made) negative. All other
curvatures will be made positive.
For METHOD=CONOPT, the mode along which the
geometry is initially perturbed from the minima.
(default is 1)
In Cartesian coordinates, this variable doesn't
count the six translation and rotation degrees.
Note that the "modes" aren't from mass-weighting.
STPT = flag to indicate whether the initial geometry
is considered a stationary point. If .true.
the initial geometry will be perturbed by
a step along the IFOLOW normal mode with
stepsize STSTEP. (default=.false.)
The positive direction is taken as the one where
the largest component of the Hessian mode is
positive. If there are more than one largest
component (symmetry), the first is taken as
positive.
Note that STPT=.TRUE. has little meaning with
HESS=GUESS as there will be many degenerate
eigenvalues.
STSTEP = Stepsize for jumping off a stationary point.
Using values of 0.05 or more may work better.
(default=0.01)
1
$STATPT
IFREEZ = array of coordinates to freeze. These may be
internal or Cartesian coordinates. For example,
IFREEZ(1)=1,3 freezes the two bond lengths in
the $ZMAT example, while optimizing the angle.
If NZVAR=0, so that this value applies to the
Cartesian coordinates instead, the input of
IFREEZ(1)=4,7 means to freeze the x coordinates
if the 2nd and 3rd atoms in the molecule.
See also IFZMAT and FVALUE in $ZMAT, and IFCART
below, as IFREEZ does not apply to DLC internals.
In a numerical Hessian run, IFREEZ specifies
Cartesian displacements to be skipped for a
Partial Hessian Analysis. For more information:
J.D.Head, Int.J.Quantum Chem. 65, 827, 1997
H.Li, J.H.Jensen
Theoret. Chem. Acc. 107, 211-219(2002)
IFCART = array of Cartesian coordinates to freeze during
a geometry optimization using delocalized internal
coordinates.
--- The next two control the hessian matrix quality ---
HESS = selects the initial hessian matrix.
= GUESS chooses a positive definite diagonal
hessian. (default for RUNTYP=OPTIMIZE)
= READ causes the hessian to be read from a $HESS
group. (default for RUNTYP=SADPOINT)
= RDAB reads only the ab initio part of the
hessian, and approximates the effective
fragment blocks.
= RDALL reads the full hessian, then converts
any fragment blocks to 6x6 T+R shape.
(this option is seldom used).
= CALC causes the hessian to be computed, see
the $FORCE group.
IHREP = the number of steps before the hessian is
recomputed. If given as 0, the hessian will
be computed only at the initial geometry if
you choose HESS=CALC, and never again. If
nonzero, the hessian is recalculated every
IHREP steps, with the update formula used on
other steps. (default=0)
HSSEND = a flag to control automatic hessian evaluation
at the end of a successful geometry search.
(default=.FALSE.)
1
$STATPT
--- the next two control the amount of output ---
Let 0 mean the initial geometry, L mean the last
geometry, and all mean every geometry.
Let INTR mean the internuclear distance matrix.
Let HESS mean the approximation to the hessian.
Note that a directly calculated hessian matrix
will always be punched, NPUN refers only to the
updated hessians used by the quasi-Newton step.
NPRT = 1 Print INTR at all, orbitals at all
0 Print INTR at all, orbitals at 0+L (default)
-1 Print INTR at all, orbitals never
-2 Print INTR at 0+L, orbitals never
NPUN = 3 Punch all orbitals and HESS at all
2 Punch all orbitals at all
1 same as 0, plus punch HESS at all
0 Punch all orbitals at 0+L, otherwise only
occupied orbitals (default)
-1 Punch occ orbitals at 0+L only
-2 Never punch orbitals
---- the following parameters are quite specialized ----
PURIFY = a flag to help eliminate the rotational and
translational degrees of freedom from the
initial hessian (and possibly initial gradient).
This is much like the variable of the same name
in $FORCE, and will be relevant only if internal
coordinates are in use. (default=.FALSE.)
PROJCT = a flag to eliminate translation and rotational
degrees of freedom from Cartesian optimizations.
The default is .TRUE. since this normally will
reduce the number of steps, except that this
variable is set false when POSITION=FIXED is
used during EFP runs.
ITBMAT = number of micro-iterations used to compute the
step in Cartesians which corresponds to the
desired step in internals. The default is 5.
UPHESS = SKIP do not update Hessian (not recommended)
BFGS default for OPTIMIZE using RFO or QA
POWELL default for OPTIMIZE using NR or CONOPT
POWELL default for SADPOINT
MSP mixed Murtagh-Sargent/Powell update
SCHLEGEL only choice for METHOD=SCHLEGEL
MOVIE = a flag to create a series of structural data
which can be show as a movie by the MacIntosh
program Chem3D. The data is written to the
file IRCDATA. (default=.FALSE.)
1
---- NNEG, RMIN, RMAX, RLIM apply only to SCHLEGEL ----
NNEG = The number of negative eigenvalues the force
constant matrix should have. If necessary the
smallest eigenvalues will be reversed. The
default is 0 for RUNTYP=OPTIMIZE, and 1 for
RUNTYP=SADPOINT.
RMIN = Minimum distance threshold. Points whose root
mean square distance from the current point is
less than RMIN are discarded. (default=0.0015)
RMAX = Maximum distance threshold. Points whose root
mean square distance from the current point is
greater than RMAX are discarded. (default=0.1)
RLIM = Linear dependence threshold. Vectors from the
current point to the previous points must not
be colinear. (default=0.07)
==========================================================
* * * * * * * * * * * * * * * * * * * * *
See the 'further information' section for
some help with OPTIMIZE and SADPOINT runs
* * * * * * * * * * * * * * * * * * * * *
1
$TRUDGE
==========================================================
$TRUDGE group (optional, required for RUNTYP=TRUDGE)
This group defines the parameters for a non-gradient
optimization of exponents or the geometry. The TRUDGE
package is a modified version of the same code from Michel
Dupuis' HONDO 7.0 system, origially written by H.F.King.
Presently the program allows for the optimization of 10
parameters.
Exponent optimization works only for uncontracted
primitives, without enforcing any constraints. Two
non-symmetry equivalent H atoms would have their p
function exponents optimized separately, and so would two
symmetry equivalent atoms! A clear case of GIGO.
Geometry optimization works only in HINT internal
coordinates (see $CONTRL and $DATA groups). The total
energy of all types of SCF wavefunctions can be optimized,
although this would be extremely stupid as gradient
methods are far more efficient. The main utility is for
open shell MP2 or CI geometry optimizations, which may
not be done in any other way with GAMESS. If your run
requires NOSYM=1 in $CONTRL, you must be sure to use only
C1 symmetry in the $DATA group.
OPTMIZ = a flag to select optimization of either geometry
or exponents of primitive gaussian functions.
= BASIS for basis set optimization.
= GEOMETRY for geometry optimization (default).
This means minima search only, there is no saddle
point capability.
NPAR = number of parameters to be optimized.
IEX = defines the parameters to be optimized.
If OPTMIZ=BASIS, IEX declares the serial number
of the Gaussian primitives for which the exponents
will be optimized.
If OPTMIZ=GEOMETRY, IEX define the pointers to
the HINT internal coordinates which will be optimized.
(Note that not all internal coordinates have to be
optimized.) The pointers to the internal coordinates
are defined as: (the number of atom on the input
list)*10 + (the number of internal coordinate for that
atom). For each atom, the HINT internal coordinates
are numbered as 1, 2, and 3 for BOND, ALPHA, and BETA,
respectively.
1
$TRUDGE
P = Defines the initial values of the parameters to be
optimized. You can use this to reset values given
in $DATA. If omitted, the $DATA values are used.
If given here, geometric data must be in Angstroms
and degrees.
A complete example is a TCSCF multireference 6-31G
geometry optimization for methylene,
$CONTRL SCFTYP=GVB CITYP=GUGA RUNTYP=TRUDGE
COORD=HINT $END
$BASIS GBASIS=N31 NGAUSS=6 $END
$DATA
Methylene TCSCF+CISD geometry optimization
Cnv 2
C 6. LC 0.00 0.0 0.00 - O K
H 1. PCC 1.00 53. 0.00 + O K I
$END
$SCF NCO=3 NPAIR=1 $END
$TRUDGE OPTMIZ=GEOMETRY NPAR=2
IEX(1)=21,22 P(1)=1.08 $END
$CIDRT GROUP=C2V SOCI=.TRUE. NFZC=1 NDOC=3 NVAL=1
NEXT=-1 $END
using GVB-PP(1), or TCSCF orbitals in the CI. The starting
bond length is reset to 1.09, while the initial angle will
be 106 (twice 53). Result after 17 steps is R=1.1283056,
half-angle=51.83377, with a CI energy of -38.9407538472
Note that you may optimize the geometry for an excited
CI state, just specify
$GUGDIA NSTATE=5 $END
$GUGDM IROOT=3 $END
to find the equilibrium geometry of the third state (of
five total states) of the symmetry implied by your $CIDRT.
==========================================================
1
$TRURST
==========================================================
$TRURST group (optional, relevant for RUNTYP=TRUDGE)
This group specifies restart parameters for TRUDGE
runs and accuracy thresholds.
KSTART indicates the conjugate gradient direction in which
the optimization will proceed. ( default = -1 )
-1 .... indicates that this is a non-restart run.
0 .... corresponds to a restart run.
FNOISE accuracy of function values.
Variation smaller than FNOISE are not considered to be
significant (Def. 0.0005)
TOLF accuracy required of the function (Def. 0.001)
TOLR accuracy required of conjugate directions (Def. 0.05)
For geometry optimization, the values which give
better results (closer to the ones obtained with gradient
methods) are: TOLF=0.0001, TOLR=0.001, FNOISE=0.00001
==========================================================
1
$FORCE
==========================================================
$FORCE group
(optional, relevant for RUNTYP=HESSIAN,OPTIMIZE,SADPOINT)
This group controls the computation of the hessian
matrix (the energy second derivative tensor, also known
as the force constant matrix), and an optional harmonic
vibrational analysis. This can be a very time consuming
calculation. However, given the force constant matrix,
the vibrational analysis for an isotopically substituted
molecule is very cheap. Related input is HESS= in
$STATPT, and the $MASS, $HESS, $GRAD, $DIPDR, $VIB groups.
METHOD = chooses the computational method.
= ANALYTIC is implemented only for SCFTYPs RHF,
ROHF, and GVB (when NPAIR is 0 or 1).
This is the default for these cases.
= NUMERIC is the default for all other cases:
UHF or MCSCF, RESC or NESC relativistic
correction, and all MP2, CI, or DFT runs.
RDHESS = a flag to read the hessian from a $HESS group,
rather than computing it. This variable pertains
only to RUNTYP=HESSIAN. See also HESS= in the
$STATPT group. (default is .FALSE.)
PURIFY = controls cleanup
Given a $ZMAT, the hessian and dipole derivative
tensor can be "purified" by transforming from
Cartesians to internals and back to Cartesians.
This effectively zeros the frequencies of the
translation and rotation "modes", along with
their IR intensities. The purified quantities
are punched out. Purification does change the
Hessian slightly, frequencies at a stationary
point can change by a wave number or so. The
change is bigger at non-stationary points.
(default=.FALSE. if $ZMAT is given)
PRTIFC = prints the internal coordinate force constants.
You MUST have defined a $ZMAT group to use this.
(Default=.FALSE.)
1
$FORCE
--- the next four apply only to METHOD=NUMERIC ----
NVIB = Number of displacements in each Cartesian
direction for force field computation.
= 1 Move one VIBSIZ unit in each positive
Cartesian direction. This requires 3N+1
evaluations of the wavefunction, energy, and
gradient, where N is the number of SYMMETRY
UNIQUE atoms given in $DATA. (default)
= 2 Move one VIBSIZ unit in the positive direction
and one VIBSIZ unit in the negative direction.
This requires 6N+1 evaluations of the
wavefunction and gradient, and gives a small
improvement in accuracy. In particular, the
frequencies will change from NVIB=1 results by
no more than 10-100 wavenumbers, and usually
much less. However, the normal modes will be
more nearly symmetry adapted, and the residual
rotational and translational "frequencies"
will be much closer to zero.
VIBSIZ = Displacement size (in Bohrs). Default=0.01
Let 0 mean the Vib0 geometry, and
D mean all the displaced geometries
NPRT = 1 Print orbitals at 0 and D
= 0 Print orbitals at 0 only (default)
NPUN = 2 Punch all orbitals at 0 and D
= 1 Punch all orbitals at 0 and occupied orbs at D
= 0 Punch all orbitals at 0 only (default)
----- the rest control normal coordinate analysis ----
VIBANL = flag to activate vibrational analysis.
(the default is .TRUE. for RUNTYP=HESSIAN, and
otherwise is .FALSE.)
SCLFAC = scale factor for vibrational frequencies, used
in calculating the zero point vibrational energy.
Some workers correct for the usual overestimate
in SCF frequencies by a factor 0.89. ZPE or other
methods might employ other factors, see A.P.Scott,
L.Radom J.Phys.Chem. 100, 16502-16513 (1996).
The output always prints unscaled frequencies, so
this value is used only during the thermochemical
analysis. (Default is 1.0)
1
$FORCE
TEMP = an array of up to ten temperatures at which the
thermochemistry should be printed out. The
default is a single temperature, 298.15 K. To
use absolute zero, input 0.001 degrees.
FREQ = an array of vibrational frequencies. If the
frequencies are given here, the hessian matrix
is not computed or read. You enter any imaginary
frequencies as negative numbers, omit the
zero frequencies corresponding to translation
and rotation, and enter all true vibrational
frequencies. Thermodynamic properties will be
printed, nothing else is done by the run.
PRTSCN = flag to print contribution of each vibrational
mode to the entropy. (Default is .FALSE.)
DECOMP = activates internal coordinate analysis.
Vibrational frequencies will be decomposed into
"intrinsic frequencies", by the method of
J.A.Boatz and M.S.Gordon, J.Phys.Chem., 93,
1819-1826(1989). If set .TRUE., the $ZMAT group
may define more than 3N-6 (3N-5) coordinates.
(default=.FALSE.)
PROJCT = controls the projection of the hessian matrix.
The projection technique is described by
W.H.Miller, N.C.Handy, J.E.Adams in J. Chem.
Phys. 1980, 72, 99-112. At stationary points,
the projection simply eliminates rotational and
translational contaminants. At points with
non-zero gradients, the projection also ensures
that one of the vibrational modes will point
along the gradient, so that there are a total of
7 zero frequencies. The other 3N-7 modes are
constrained to be orthogonal to the gradient.
Because the projection has such a large effect on
the hessian, the hessian punched is the one
BEFORE projection. For the same reason, the
default is .FALSE. to skip the projection, which
is mainly of interest in dynamical calculations.
==========================================================
There is a set of programs for the calculation of kinetic
or equilibrium isotope effects from the group of Piotr
Paneth at the University of Lodz. This ISOEFF package will
accept data computed by GAMESS, and can be downloaded at
http://ck-sg.p.lodz.pl/isoeff/isoeff.html
1
$CPHF
==========================================================
$CPHF group (relevant for analytic RUNTYP=HESSIAN)
This group controls the solution of the response
equations, also known as coupled Hartree-Fock.
POLAR = a flag to request computation of the static
polarizability, alpha. Because this property
needs 3 additional response vectors, beyond those
needed for the hessian, the default is to skip the
property. (default = .FALSE.)
NWORD = controls memory usage for this step. The default
uses all available memory. (default=0)
==========================================================
1
$HESS $GRAD $DIPDR
==========================================================
$HESS group (relevant for RUNTYP=HESSIAN if RDHESS=.TRUE.)
(relevant for RUNTYP=IRC if FREQ,CMODE not given)
(relevant for RUNTYP=OPTIMIZE,SADPOINT if HESS=READ)
Formatted force constant matrix (FCM), i.e. hessian
matrix. This data is punched out by a RUNTYP=HESSIAN job,
in the correct format for subsequent runs. The first card
in the group must be a title card.
A $HESS group is always punched in Cartesians. It
will be transformed into internal coordinate space if a
geometry search uses internals. It will be mass weighted
(according to $MASS) for IRC and frequency runs.
The initial FCM is updated during the course of a
geometry optimization or saddle point search, and will be
punched if a run exhausts its time limit. This allows
restarts where the job leaves off. You may want to read
this FCM back into the program for your restart, or you
may prefer to regenerate a new initial hessian. In any
case, this updated hessian is absolutely not suitable for
frequency prediction!
==========================================================
$GRAD group (relevant for RUNTYP=OPTIMIZE or SADPOINT)
(relevant for RUNTYP=HESSIAN when RDHESS=.TRUE.)
Formatted gradient vector at the $DATA geometry. This
data is read in the same format it was punched out.
For RUNTYP=HESSIAN, this information is used to
determine if you are at a stationary point, and possibly
for projection. If omitted, the program pretends the
gradient is zero, and otherwise proceeds normally.
For geometry searches, this information (if known) can
be read into the program so that the first step can be
taken instantly.
==========================================================
$DIPDR group (relevant for RUNTYP=HESSIAN if RDHESS=.T.)
Formatted dipole derivative tensor, punched in a previous
RUNTYP=HESSIAN job. If this group is omitted, then a
vibrational analysis will be unable to predict the IR
intensities, but the run can otherwise proceed.
==========================================================
1
$VIB $MASS
==========================================================
$VIB group (relevant for RUNTYP=HESSIAN, METHOD=NUMERIC)
Formatted card image -restart- data. This data is
read in the format it was punched by a previous HESSIAN
job to the file IRCDATA. Just add a " $END" card, and if
the final gradient was punched as zero, delete the last
set of data. Normally, IREST in $CONTRL will NOT be used
in conjunction with a HESSIAN restart. The mere presence
of this deck triggers the restart from cards. This deck
can also be used to turn a single point differencing run
into double differencing, as well as recovering from time
limits, or other bombouts.
==========================================================
$MASS group (relevant for RUNTYP=HESSIAN, IRC, or DRC)
This group permits isotopic substitution during the
computation of mass weighted Cartesian coordinates. Of
course, the masses affect the frequencies and normal modes
of vibration.
AMASS = An array giving the atomic masses, in amu. The
default is to use the mass of the most abundant
isotope. Masses through element 104 are stored.
example - $MASS AMASS(3)=2.0140 $END
will make the third atom in the molecule a deuterium.
==========================================================
1
$IRC
==========================================================
$IRC group (relevant for RUNTYP=IRC)
This group governs the location of the intrinsic
reaction coordinate, a steepest descent path in mass
weighted corrdinates, that connects the saddle point to
reactants and products.
----- there are five integration methods chosen by PACE.
PACE = GS2 selects the Gonzalez-Schlegel second order
method. This is the default method.
Related input is:
GCUT cutoff for the norm of the mass-weighted gradient
tangent (the default is chosen in the range from
0.00005 to 0.00020, depending on the value for
STRIDE chosen below.
RCUT cutoff for Cartesian RMS displacement vector.
(the default is chosen in the range 0.0005 to
0.0020 Bohr, depending on the value for STRIDE)
ACUT maximum angle from end points for linear
interpolation (default=5 degrees)
MXOPT maximum number of contrained optimization steps
for each IRC point (default=20)
IHUPD is the hessian update formula. 1 means Powell,
2 means BFGS (default=2)
GA is a gradient from the previous IRC point, and is
used when restarting.
OPTTOL is a gradient cutoff used to determine if the IRC
is approaching a minimum. It has the same meaning
as the variable in $STATPT. (default=0.0001)
PACE = LINEAR selects linear gradient following (Euler's
method). Related input is:
STABLZ switches on Ishida/Morokuma/Komornicki reaction
path stabilization. The default is .TRUE.
DELTA initial step size along the unit bisector, if
STABLZ is on. Default=0.025 Bohr.
ELBOW is the collinearity threshold above which the
stabilization is skipped. If the mass weighted
gradients at QB and QC are almost collinear, the
reaction path is deemed to be curving very little,
and stabilization isn't needed. The default is
175.0 degrees. To always perform stabilization,
input 180.0.
READQB,EB,GBNORM,GB are energy and gradient data
already known at the current IRC point. If it
happens that a run with STABLZ on decides to skip
stabilization because of ELBOW, this data will be
punched to speed the restart.
1
$IRC
PACE = QUAD selects quadratic gradient following.
Related input is:
SAB distance to previous point on the IRC.
GA gradient vector at that historical point.
PACE = AMPC4 selects the fourth order Adams-Moulton
variable step predictor-corrector.
Related input is:
GA0,GA1,GA2 which are gradients at previous points.
PACE = RK4 selects the 4th order Runge-Kutta variable
step method. There is no related input.
----- The next two are used by all PACE choices -----
STRIDE = Determines how far apart points on the reaction
path will be. STRIDE is used to calculate the
step taken, according to the PACE you choose.
The default is good for the GS2 method, which is
very robust. Other methods should request much
smaller step sizes, such as 0.10 or even 0.05.
(default = 0.30 sqrt(amu)-Bohr)
NPOINT = The number of IRC points to be located in this
run. The default is to find only the next point.
(default = 1)
----- The next two let you choose your output volume -----
Let F mean the first IRC point found in this run,
and L mean the final IRC point of this run.
Let INTR mean the internuclear distance matrix.
NPRT = 1 Print INTR at all, orbitals at all IRC points
0 Print INTR at all, orbitals at F+L (default)
-1 Print INTR at all, orbitals never
-2 Print INTR at F+L, orbitals never
NPUN = 1 Punch all orbitals at all IRC points
0 Punch all orbitals at F+L, only occupied
orbitals at IRC points between (default)
-1 Punch all orbitals at F+L only
-2 Never punch orbitals
1
$IRC
----- The next two tally the reaction path results. The
defaults are appropriate for starting from a saddle
point, restart values are automatically punched out.
NEXTPT = The number of the next point to be computed.
STOTAL = Total distance along the reaction path to next
IRC point, in mass weighted Cartesian space.
----- The following controls jumping off the saddle point.
If you give a $HESS group, FREQ and CMODE will be
generated automatically.
SADDLE = A logical variable telling if the coordinates
given in the $DATA deck are at a saddle point
(.TRUE.) or some other point lying on the IRC
(.FALSE.). If SADDLE is true, either a $HESS
group or else FREQ and CMODE must be given.
(default = .FALSE.) Related input is:
TSENGY = A logical variable controlling whether the energy
and wavefunction are evaluated at the transition
state coordinates given in $DATA. Since you
already know the energy from the transition state
search and force field runs, the default is .F.
FORWRD = A logical variable controlling the direction to
proceed away from a saddle point. The forward
direction is defined as the direction in which
the largest magnitude component of the imaginary
normal mode is positive. (default =.TRUE.)
EVIB = Desired decrease in energy when following the
imaginary normal mode away from a saddle point.
(default=0.0005 Hartree)
FREQ = The magnitude of the imaginary frequency, given
in cm**-1.
CMODE = An array of the components of the normal mode
whose frequency is imaginary, in Cartesian
coordinates. Be careful with the signs!
You must give FREQ and CMODE if you don't give a $HESS
group, when SADDLE=.TRUE. The option of giving these
two variables instead of a $HESS does not apply to the
GS2 method, which must have a hessian input, even for
restarts. Note also that EVIB is ignored by GS2 runs.
==========================================================
* * * * * * * * * * * * * * * * * *
For hints about IRC tracking, see
the 'further information' section.
* * * * * * * * * * * * * * * * * *
1
$VSCF
==========================================================
$VSCF group (optional, relevant to RUNTYP=VSCF)
This group governs the computation of frequencies
including anharmonic effects. Besides the values shown
below, the input file must contain a $HESS group and
perhaps a $DIPDR group, to start with previously obtained
harmonic vibrational information. Energies are sampled
along the directions of harmonic normal modes, and along
pairs of harmonic normal modes, after which vibrational
nuclear wavefunctions are obtained at an SCF-like level,
termed VSCF, using product nuclear wavefunctions. An
MP2-like correction to the vibrational energy, termed
correlation corrected (cc-VSCF), is also obtained. In
addition, degenerate pertubation theory is performed,
based on a CI reference that includes linear combinations
of degenerate states. By default, the dipole is computed
at every grid point to give improved IR intensity values.
See also the restart group $VIBSCF.
NGRID = number of grid points to be computed along each
harmonic normal mode, and if NCOUP=2, along each
pair of modes. Reasonable values are 8 or 16,
with 16 considered significantly more accurate.
(default=16)
NCOUP = the order of mode couplings included.
= 1 computes 1-D grids along each harmonic mode
= 2 adds additionally, 2-D grids along each pair
of normal modes. (default)
The total number of energy and dipole evaluations
for NCOUP=2 is M*NGRID + M*(M-1)/2*NGRID**2, where
M is the number of normal modes: M = 3N-6 or 3N-5.
The next five relate to the solver for the vibrational
states. The default is a degenerate perturbation theory
treatment including the ground and every singly excited
vibrational level.
VDPT = flag to use 2nd order degenerate perturbation
theory to find vibrational energys. Turning this
off causes only a CI singles and doubles treatment
to be made. (default=.true.)
ICASX = vibrational excitation level to include in the
solver's basis. 1,2... mean first, second...
excitations will be included. The default, 1,
includes single quantum excited states only.
ICAS1, ICAS2 = starting and ending vibrations whose quanta
are included, according to ICASX. The default is
all modes, ICAS1=1 and ICAS2=3N-6.
SFACT = a numerical cutoff for small contributions in
the solver. The default is 1d-5.
1
$VSCF
CASMIN = a flag, largely redundant, that ensures default
settings for ICAS1 and ICAS2
The solver finds the ground state (v=0) by default, but
will readily find excited levels (such as all v=1) if
restarted. Note that IEXC is one greater than the sum of
the vibrational quantum numbers.
IEXC = 1 obtain fundamental frequencies (default)
= 2 instead, obtain first overtones
= 3 instead, obtain second overtones
IEXC higher than 1 may be speedily obtained
using the next parameter to restart with a
completed $VIBSCF group.
READV = flag to indicate restart data $VIBSCF should be
read in to resume an interrupted calculation, or
to obtain overtones in follow-on runs.
(default is .FALSE.)
IMODE = array of modes for which anharmonic effects will
be computed. IMODE(1)=10,19 computes anharmonic
energies and wavefunctions for modes 10 and 19,
only. In the current implementation, pairs of
modes cannot be coupled, so NCOUP is forced to 1
if this option is specified.
PROJCT = controls the projection of the hessian matrix
(same meaning as in $FORCE). Default is .FALSE.,
but is .TRUE. if IFREEZ is specified in $STATPT.
The next two relate to simplified intensity computation.
These simplifications are aimed at speeding up MP2 runs,
if one cares not so much about intensities, and so would
like to reduce CPU for computing dipoles. It is pointless
to select DMDR for SCF electronic structure, where the
dipoles are easily obtainable. DMDR must not be used if
overtones are being computed.
DMDR = if true, indicates that the harmonic dipole
derivative tensor $DIPDR is input, rather than
computing the dipoles. (default is .FALSE.)
MPDIP = for MP2 electronic structure, a value of .FALSE.
uses SCF level dipoles in order to save the time
needed to obtain the MP2 density at every grid
point. It is more accurate to use the DMDR flag
instead of this option, if $DIPDR is available.
Obviously this variable is irrelevant for SCF
level electronic structure. (default=.TRUE.)
VCFCT = scaling factor for pair-coupling potential.
Sometimes when pair-coupling potential values
are larger than the corresponding single mode
values, they must be scaled down. (Default=1.0)
1
$VIBSCF
==========================================================
$VIBSCF group (optional, relevant to RUNTYP=VSCF)
This is restart data, as written to file IRCDATA in a
partially completed previous run. Append a " $END" line,
and select READV=.TRUE. to read the data.
==========================================================
1
$DRC
==========================================================
$DRC group (relevant for RUNTYP=DRC)
This group governs the dynamical reaction coordinate,
a classical trajectory method based on quantum chemical
potential energy surfaces. In GAMESS these may be either
ab initio or semi-empirical. Because the vibrational
period of a normal mode with frequency 500 wavenumbers is
67 fs, a DRC needs to run for many steps in order to
sample a representative portion of phase space. Almost
all DRCs break molecular symmetry, so build your molecule
with C1 symmetry in $DATA, or specify NOSYM=1 in $CONTRL.
Restart data can be found in the job's OUTPUT file, with
important results summarized to the IRCDATA file.
NSTEP = The number of DRC points to be calculated, not
including the initial point. (default = 1000)
DELTAT = is the time step. (default = 0.1 fs)
TOTIME = total duration of the DRC computed in a previous
job, in fs. The default is the correct value
when initiating a DRC. (default=0.0 fs)
* * *
In general, a DRC can be initiated anywhere,
so $DATA might contain coordinates of the
equilibrium geometry, or a nearby transition
state, or something else. You must also
supply an initial kinetic energy, and the
direction of the initial velocity, for which
there are a number of options:
EKIN = The initial kinetic energy (default = 0.0 kcal/mol)
See also ENM, NVEL, and VIBLVL regarding alternate
ways to specify the initial value.
VEL = an array of velocity components, in Bohr/fs.
When NVEL is false, this is simply the direction
of the velocity vector. Its magnitude will be
automatically adjusted to match the desired initial
kinetic energy, and it will be projected so that
the translation of the center of mass is removed.
Give in the order vx1, vy1, vz1, vx2, vy2, ...
NVEL = a flag to compute the initial kinetic energy from
the input VEL using the sum of mass*VEL*VEL/2.
This flag is usually selected only for restarts.
(default=.FALSE.)
1
$DRC
The next three allow the kinetic energy to be
partitioned over all normal modes. The
coordinates in $DATA are likely to be from
a stationary point! You must also supply a
$HESS group, which is the nuclear force constant
matrix at the starting geometry.
VIBLVL = a flag to turn this option on (default=.FALSE.)
VIBENG = an array of energies (in units of multiples of
the hv of each mode) to be imparted along each
normal mode. The default is to assign the zero
point energy only, VIBENG(1)=0.5, 0.5, ..., 0.5
when HESS=MIN, and 0.0, 0.5, ..., 0.5 if HESS=TS.
If given as a negative number, the initial
direction of the velocity vector is along the
reverse direction of the mode. "Reverse" means
the phase of the normal mode is chosen such that
the largest magnitude component is a negative
value. An example might be VIBENG(4)=2.5 to add
two quanta to mode 4, along with zero point
energy in all modes.
RCENG = reaction coordinate energy, in kcal/mol. This is
the initial kinetic energy given to the imaginary
frequency normal mode when HESS=TS. If this is
given as a negative value, the direction of the
velocity vector will be the "reverse direction",
meaning the phase of the normal mode will be
chosen so its largest component is negative.
* * *
The next two pertain to initiating the DRC along
a single normal mode of vibration. No kinetic
energy is assigned to the other modes. You must
also supply a $HESS group at the initial geometry.
NNM = The number of the normal mode to which the initial
kinetic energy is given. The absolute value of NNM
must be in the range 1, 2, ..., 3N-6. If NNM is a
positive/negative value, the initial velocity will
lie in the forward/reverse direction of the mode.
"Forward" means the largest component of the normal
mode is a positive value. (default=0)
ENM = the initial kinetic energy given to mode NNM,
in units of vibrational quanta hv, so the amount
depends on mode NNM's vibrational frequency, v.
If you prefer to impart an arbitrary initial
kinetic energy to mode NNM, specify EKIN instead.
(default = 0.0 quanta)
1
$DRC
To summarize, there are 5 ways to initiate a trajectory:
1. VEL vector with NVEL=.TRUE. This is difficult to
specify at your initial point, and so this option
is mainly used when restarting your trajectory.
The restart information is always in this format.
2. VEL vector and EKIN with NVEL=.FALSE. This will
give a desired amount of kinetic energy in the
direction of the velocity vector.
3. VIBLVL and VIBENG and possibly RCENG, to give some
initial kinetic energy to all normal modes.
4. NNM and ENM to give quanta to a single normal mode.
5. NNM and EKIN to give arbitrary kinetic energy to
a single normal mode.
* * *
The most common use of the next two is to analyze
a trajectory with respect to the normal modes of
a minimum energy geometry it travels around.
NMANAL = a flag to select mapping of the mass-weighted
Cartesian DRC coordinates and velocity (conjugate
momentum) in terms of normal modes at a nearby
reference stationary point (which can be either a
minimum or transition state). This reference
geometry could in fact be the same as the initial
point of the DRC, but does not need to be.
If you choose this option, you must supply C0,
HESS2, and a $HESS2 group corresponding to the
reference stationary point. (default=.FALSE.)
C0 = an array of the coordinates of the stationary
reference point (the coordinates in $DATA might
well be some other coordinates). Give in the
order x1,y1,z1,x2,y2,... in Angstroms.
* * *
The next options apply to input choices which may
read a $HESS at the initial DRC point, namely NNM
or VIBLVL, or to those that read a $HESS2 at some
reference geometry (NMANAL).
HESS = MIN indicates the hessian supplied for the initial
geometry corresponds to a minimum (default).
= TS indicates the hessian is for a saddle point.
HESS2 = MIN (default) or TS, the same meaning, for the
reference geometry.
These are used to decide if modes 1-6 (minimum) or
modes 2-7 (TS) are to be excluded from the hessian
as the translational and rotational contaminants.
If the initial and reference geometries are the same,
these two hessians will be duplicates of each other.
1
$DRC
The next variables can cause termination of a run, if
molecular fragments get too far apart or close together.
NFRGPR = Number of atom pairs whose distance will be
checked. (default is 0)
IFRGPR = Array of the atom pairs. 2 times NFRGPR values.
FRGCUT = Array for a boundary distance (in Bohr) for atom
pairs to end DRC calculations. The run will
stop if any distance exceeds the tolerance, or if
a value is given as a negative number, if the
distance becomes shorter than the absolute value.
In case the trajectory starts outside the bounds
specified, they do not apply until after the
trajectory reaches a point where the criteria
are satisfied, and then goes outside again.
Give NFRGPR values.
* * *
The final variables control the volume of output.
Let F mean the first DRC point found in this run,
and L mean the last DRC point of this run.
NPRTSM = summarize the DRC results every NPRTSM steps,
to the file IRCDATA. (default = 1)
NPRT = 1 Print orbitals at all DRC points
0 Print orbitals at F+L (default)
-1 Never print orbitals
NPUN = 2 Punch all orbitals at all DRC points
1 Punch all orbitals at F+L, and occupied
orbitals at DRC points between
0 Punch all orbitals at F+L only (default)
-1 Never punch orbitals
==========================================================
References: see REFS.DOC.
1
$GLOBOP
==========================================================
$GLOBOP group (optional, relevant to RUNTYP=GLOBOP)
This controls a search for the global minimum energy.
It is primarily intended for locating the best position
for effective fragment "solvent" molecules, perhaps with
an ab initio "solute" present also. There are options for
a single temperature Monte Carlo search, or a multi-
temperature simulated annealing. Local minimization of
some or all of the structures selected by the Monte Carlo
is optional. The coordinates of accepted structures are
written to file IRCDATA, unless MOVIE2 is chosen. See
REFS.DOC for an overview of this RUNTYP.
TEMPI = initial temperature used in the simulation.
(default = 20000 K)
TEMPF = final temperature. If TEMPF is not given and
NTEMPS is greater than 1, TEMPF will be
calculated based on a cooling factor of 0.95.
NTEMPS = number of temperatures used in the simulation.
If NTEMPS is not given but TEMPF is given,
NTEMP will be calculated based on a cooling
factor of 0.95. If neither NTEMP nor TEMPF is
given, the job defaults to a single temperature
Monte Carlo calculation.
NFRMOV = number of fragments to move on each step.
(default=1)
NGEOPT = number of geometries to be evaluated at each
temperature. (default = 100)
NTRAN = number of translational steps in each block.
(default=5)
NROT = number of rotational steps in each block.
(default=5)
NBLOCK = the number of blocks of steps can be set directly
with this variable, instead of being calculated
from NGEOPT, NTRAN, and NROT, according to
NBLOCK=NGEOPT/(NTRAN+NROT)
If NBLOCK is input, the number of geometries at
each temperature will be taken as
NGEOPT=NBLOCK*(NTRAN+NROT)
Each block has NTRAN translational steps followed
by NROT rotational steps.
1
$GLOBOP
MCMIN = flag to enable geometry optimization to minimize
the energy is carried out every NSTMIN steps.
(default=.true.)
NSTMIN = After this number of geometry steps are taken, a
local (Newton-Raphson) optimization will be
carried out. If this variable is set to 1, a
local minimization is carried out on every step,
reducing the MC space to the set of local minima.
Irrelevant if MCMIN is false. (default=10)
OPTN = if set to .TRUE., at the end of the run local
minimizations are carried out on the final
geometry and on the minimum-energy geometry.
(default=.FALSE.)
SCALE = an array of length two. The first element is the
initial maximum step size for the translational
coordinates (Angstroms). The second element is
the initial maximum stepsize for the rotational
coordinates (pi-radians). (defaults = 1,1)
AIMOVE = step range for moving ab initio atoms in the MC
simulation. If set to zero, the ab initio atoms
do not move in MC. The motion of ab initio atoms
is unsophisticated, as the move consists only of
shifting each Cartesian coordinate in the range
of plus AIMOVE to minus AIMOVE atomic units. Ab
initio atoms are allowed to relax during possible
geometry optimizations implied by MCMIN/NSTMIN.
(default=0.0)
ALPHA = controls the rate at which information from
successful steps is folded into the maximum step
sizes for each of the 6*(number of fragments)
coordinates. ALPHA varies between 0 and 1.
ALPHA=0 means do not change the maximum step
sizes, and ALPHA=1 throws out the old step sizes
whenever there is a successful step and uses the
successful step sizes as the new maxima. This
update scheme was used with the Parks method
where all fragments are moved on every step. It
is normally not used with the Metropolis method.
(default = 0)
DACRAT = the desired acceptance ratio, the program tries
to achieve this by adjusting the maximum step
size. (default = 0.5)
1
$GLOBOP
UPDFAC = the factor used to update the maximum step size
in the attempt to achive the desired acceptance
ratio (DACRAT). If the acceptance ratio at the
previous temperature was below DACRAT, the step
size is decreased by multiplying it by UPDFAC.
If the acceptance ratio was above DACRAT, the
step size is increased by dividing it by DACRAT
It should be between 0 and 1. (default = 0.95)
SEPTOL = the separation tolerence between atoms in the ab
initio piece and atoms in the fragments, as well
as between atoms in different fragments. If a
step moves atoms closer than this tolerence, the
step is rejected. (default = 1.5 Angstroms)
XMIN, XMAX, YMIN, YMAX, ZMIN, ZMAX = mimimum and maximum
values for the Cartesian coordinates of the
fragment. If the first point in a fragment steps
outside these boundaries, periodic boundary
conditions are used and the fragment re-enters on
the opposite side of the box. The defaults of
-10 for minima and +10 for maxima should usually
be changed.
BOLTWT = method for calculating the Boltzmann factor,
which is used as the probability of accepting a
step that increases the energy.
= STANDARD = use the standard Boltzmann factor,
exp(-delta(E)/kT) (default)
= AVESTEP = scale the temperature by the average
step size, as recommended in the Parks reference
when using values of ALPHA greater than 0.
NPRT = controls the amount of output, with
= -2 reduces output below that of -1
= -1 reduces output further, needed for MCMIN=.true.
= 0 gives minimal output (default)
= 1 gives the normal GAMESS amount of output
= 2 gives maximum output
For large simulations, even IOUT=0 may produce
a log file too large to work with easily.
If geometry optimization is being done at each
Monte Carlo generated structure, you can use
the NPRT in $STATPT to further suppress output.
RANDOM = controls the choice of random number generator.
= DEBUG uses a simple random number generator with
a constant seed. Since the same sequence of
random numbers is generated during each job, it
is useful for debugging.
= RAND1 uses the simple random number generator
used in DEBUG, but with a variable seed.
= RAND3 uses a more sophisticated random number
generator described in Numerical Recipes, with a
variable seed (default).
1
$GLOBOP
IFXFRG = array whose length is the number of fragments.
It allows one or more fragments to be fixed
during the simulation.
=0 allows the fragment to move during the run
=1 fixes the fragment
For example, IFXFRG(3)=1 would fix the third
fragment, the default is IFXFRG(1)=0,0,0,...,0
MOVIE2 = a flag to create a series of structural data
which can be shown as a movie by the MacIntosh
program Chem3D. The coordinates of each accepted
geometry are written. The data is written to the
file IRCDATA. (default=.FALSE.)
==========================================================
1
$GRADEX
==========================================================
$GRADEX group (optional, for RUNTYP=GRADEXTR)
This group controls the gradient extremal following
algorithm. The GEs leave stationary points parallel to
each of the normal modes of the hessian. Sometimes a GE
leaving a minimum will find a transition state, and thus
provides us with a way of finding that saddle point. GEs
have many unusual mathematical properties, and you should
be aware that they normally differ a great deal from IRCs.
The search will always be performed in cartesian
coordinates, but internal coordinates along the way may
be printed by the usual specification of NZVAR and $ZMAT.
METHOD = algorithm selection.
SR A predictor-corrector method due to Sun
and Ruedenberg (default).
JJH A method due to Jorgensen, Jensen and
Helgaker.
NSTEP = maximum number of predictor steps to take.
(default=50)
DPRED = the stepsize for the predictor step.
(default = 0.10)
STPT = a flag to indicate whether the initial geometry
is considered a stationary point. If .TRUE.,
the geometry will be perturbed by STSTEP along
the IFOLOW normal mode.
(default = .TRUE.)
STSTEP = the stepsize for jumping away from a stationary
point. (default = 0.01)
IFOLOW = Mode selection option. (default is 1)
If STPT=.TRUE., the intial geometry will be
perturbed by STSTEP along the IFOLOW normal mode.
Note that IFOLOW can be positive or negative,
depending on the direction the normal mode
should be followed in. The positive direction
is defined as the one where the largest component
of the Hessian eigenvector is positive.
If STPT=.FALSE. the sign of IFOLOW determines
which direction the GE is followed in. A positive
value will follow the GE in the uphill direction.
The value of IFOLOW should be set to the Hessian
mode which is parallel to the gradient to avoid
miscellaneous warning messages.
1
$GRADEX
GOFRST = a flag to indicate whether the algorithm should
attempt to locate a stationary point. If .TRUE.,
a straight NR search is performed once the NR
step length drops below SNRMAX. 10 NR step are
othen allowed, a value which cannot be changed.
(default = .TRUE.)
SNRMAX = upper limit for switching to straight NR search
for stationary point location.
(default = 0.10 or DPRED, whichever is smallest)
OPTTOL = gradient convergence tolerance, in Hartree/Bohr.
Used for optimizing to a stationary point.
Convergence of a geometry search requires the
rms gradient to be less than OPTTOL.
(default=0.0001)
HESS = selection of the initial hessian matrix, if
STPT=.TRUE.
= READ causes the hessian to be read from a $HESS
group.
= CALC causes the hessian to be computed. (default)
1
$GRADEX
---- parameters on this page apply only to METHOD=SR ----
DELCOR = the corrector step should be smaller than this
value before the next predictor step is taken.
(default = 0.001)
MYSTEP = maximum number of micro iteration allowed to
bring the corrector step length below DELCOR.
(default=20)
SNUMH = stepsize used in the numerical differentiation
of the Hessian to produce third derivatives.
(default = 0.0001)
HSDFDB = flag to select determination of third derivatives.
At the current geometry we need the gradient, the
Hessian, and the partial third derivative matrix
in the gradient direction.
If .TRUE., the gradient is calculated at the
current geometry, and two Hessians are calculated
at SNUMH distance to each side in the gradient
direction. The Hessian at the geometry is formed
as the average of the two displaced Hessians.
If .FALSE., both the gradient and Hessian are
calculated at the current geometry, and one
additional Hessian is calculated at SNUMH in the
gradient direction.
The default double-sided differentiation produces
a more accurate third derivative matrix, at the
cost of an additional wave function and gradient.
(default = .TRUE.)
==========================================================
* * * * * * * * * * * * * * * * * * *
See the 'further information' section
for some help with GRADEXTR runs.
* * * * * * * * * * * * * * * * * * *
1
$SURF
==========================================================
$SURF group (relevant for RUNTYP=SURFACE)
This group allows you to probe a potential energy
surface along a small grid of points. Note that there is
no option to vary angles, only distances. The scan can
be made for any SCFTYP, or for the MP2 or CI surface. You
may specify two rather different calculations to be done
at each point on the grid, through the RUNTYPn, SCFTYPn,
and electron correlation keywords.
* * * below, 1 and 2 refer to different calculations * * *
RUNTP1,RUNTYP2 = some RUNTYP supported in $CONTRL
First RUNTYP=RUNTP1 and then RUNTYP=RUNTP2 will be
performed, for each point on the grid. The second
run is omitted if RUNTP2 is set to NONE.
default: RUNTP1=ENERGY RUNTP2=NONE
SCFTP1,SCFTP2 = some SCFTYP supported in $CONTRL
default: SCFTYP in $CONTRL
CITYP1,CITYP2 = some CITYP supported in $CONTRL
default: CITYP in $CONTRL
MPLEV1,MPLEV2 = some MPLEVL supported in $CONTRL
default: MPLEVL in $CONTRL
CCTYP1,CCTYP2 = some CCTYP supported in $CONTRL
default: CCTYP in $CONTRL
DFTYP1,DFTYP2 = some DFTTYP supported in $DFT
default: DFTTYP in $DFT
You may need to help by giving values in $CONTRL that will
permit the program to estimate what is coming in the values
here. For example, if you want to request hessians here,
it may be good to give RUNTYP=HESSIAN in $CONTRL so that
in its earliest stages of a job, the program can initialize
for 2nd derivatives. There is less checking here than on
$CONTRL input, so don't request something impossible such
as two correlaton methods simultaneously, or analytic
hessians for MP2, or other things that are impossible.
* * * below, 1 and 2 refer to different coordinates * * *
IVEC1 = an array of two atoms, defining a coordinate from
the first atom given, to the second.
IGRP1 = an array specifying a group of atoms, which must
include the second atom given in IVEC1. The
entire group will be translated (rigidly) along
the vector IVEC1, relative to the first atom
given in IVEC1.
1
$SURF
ORIG1 = starting value of the coordinate, which may be
positive or negative. Zero corresponds to the
distance given in $DATA.
DISP1 = step size for the coordinate. If DISP1 is set
to zero, then the keyword GRID1 is read.
NDISP1 = number of steps to take for this coordinate.
GRID1 = an array of grid points at which to compute the
energy. This option is an alternative to the
ORIG1, DISP1 input which produces an equidistant
grid. To use GRID1, one has to set DISP1=0.0.
The number of grid points is given in NDISP1, and
is limite to at most 100 grid points. The input
of GRID1(1)=ORIG1,ORIG1+DISP1,ORIG1+DISP1*2,...
would reproduce an equidistant grid given by ORIG1
and DISP1.
ORIG1, DISP1, and GRID1 should be given in Angstrom.
There are no reasonable defaults for these keywords.
IVEC2, IGRP2, ORIG2, DISP2, NDISP2, GRID2 have the same
meaning as their "1" counterparts, and permit you to make
a two dimensional map along two displacement coordinates.
If the "2" data are not input, the surface map proceeds in
only one dimension.
==========================================================
1
$LOCAL
==========================================================
$LOCAL group (relevant for LOCAL=RUEDNBRG, BOYS, or POP)
This group allows input of additional data to control
the localization methods. If no input is provided, the
valence orbitals will be localized as much as possible,
while still leaving the wavefunction invariant. There are
many specialized options for Localized Charge Distribution
analysis, and for EFP generation.
N.B. Since Boys localization needs the dipole integrals,
do not turn off dipole moment calculation in $ELMOM.
MAXLOC = maximum number of localization cycles. This
applies to BOYS or POP methods only. If the
localization fails to converge, a different
order of 2x2 pairwise rotations will be tried.
(default=250)
CVGLOC = convergence criterion. The default provides
LMO coefficients accurate to 6 figures.
(default=1.0E-6)
SYMLOC = a flag to restrict localization so that orbitals
of different symmetry types are not mixed. This
option is not supported in all possible point
groups. The purpose of this option is to give a
better choice for the starting orbitals for GVB-PP
or MCSCF runs, without destroying the orbital's
symmetry. This option is compatible with each of
the 3 methods of selecting the orbitals to be
included. (default=.FALSE.)
ORIENT = a flag to request orientation of the localized
orbitals for bond-order analysis. After the
localization, the orbitals on each atom are
rotated only among themselves, in order to direct
the orbitals towards neighboring atom's orbitals,
to which they are bonded. The density matrix,
or bond-order matrix, of these Oriented LMOs is
readily interpreted as atomic populations and
bond orders. This option can be used only for
SCFTYP=MCSCF and LOCAL=RUEDENBRG.
(default=.FALSE.)
PRTLOC = a flag to control supplemental printout. The
extra output is the rotation matrix to the
localized orbitals, and, for the Boys method,
the orbital centroids, for the Ruedenberg
method, the coulomb and exchange matrices,
for the population method, atomic populations.
(default=.FALSE.)
1
$LOCAL
----- The following keywords select the orbitals which
are to be included in the localization. You may
select from FCORE, NOUTA/NOUTB, or NINA/NINB,
but may choose only one of these three groups.
FCORE = flag to freeze all the chemical core orbitals
present. All the valence orbitals will be
localized. You must explicitly turn this
option off to choose one of the other two
orbital selection options. (default=.TRUE.)
* * *
NOUTA = number of alpha orbitals to hold fixed in the
localization. (default=0)
MOOUTA = an array of NOUTA elements giving the numbers of
the orbitals to hold fixed. For example, the
input NOUTA=2 MOOUTA(1)=8,13 will freeze only
orbitals 8 and 13. You must enter all the
orbitals you want to freeze, including any cores.
This variable has nothing to do with cows.
NOUTB = number of beta orbitals to hold fixed in -UHF-
localizations. (default=0)
MOOUTB = same as MOOUTA, except that it applies to the
beta orbitals, in -UHF- wavefunctions only.
* * *
NINA = number of alpha orbitals which are to be
included in the localization. (default=0)
MOINA = an array of NINA elements giving the numbers of
the orbitals to be included in the localization.
Any orbitals not mentioned will be frozen.
NINB = number of -UHF- beta MOs in the localization.
(default=0)
MOINB = same as MOINA, except that it applies to the
beta orbitals, in -UHF- wavefunctions only.
ORMFUL = this flag is relevant only to CISTEP=ORMAS MCSCF
localizations. By default, the localization is
restricted such that the multiple active spaces
are not mixed, leaving the total wavefunction
invariant. It may be used to localize within the
full range of active MOs. (Default is .FALSE.)
1
$LOCAL
----- The following keywords are used for the localized
charge distribution (LCD) energy decomposition.
EDCOMP = flag to turn on LCD energy decomposition.
Note that this method is currently implemented
for SCFTYP=RHF and ROHF and LOCAL=RUEDNBRG only.
The SCF LCD forces all orbitals to be localized,
overriding input on the previous page. See also
LMOMP2 in the $MP2 group. (default = .FALSE.)
$LOCAL
MOIDON = flag to turn on LMO identification and subsequent
LMO reordering, and assign nuclear LCD automat-
ically. (default = .FALSE.)
DIPDCM = flag for LCD molecular dipole decomposition.
(default = .FALSE.)
QADDCM = flag for LCD molecular quadrupole decomposition.
(default = .FALSE.)
POLDCM = flag to turn on LCD polarizability decomposition.
This method is implemented for SCFTYP=RHF or ROHF
and LOCAL=BOYS or RUEDNBRG. (default=.FALSE.)
POLNUM = flag to forces numerical rather than analytical
calculation of the polarizabilities. This may be
useful in larger molecules. The numerical
polarizabilities of bonds in or around aromatic
rings sometimes are unphysical. (default=.FALSE.)
See D.R.Garmer, W.J.Stevens
J.Phys.Chem. 93, 8263-8270(1989).
POLAPP = flag to force calculation of the polarizabilities
using a perturbation theory expression. This may
be useful in larger molecules. (default=.FALSE.)
See R.M. Minikis, V. Kairys, J.H. Jensen
J.Phys.Chem.A 105, 3829-3837(2001)
POLANG = flag to choose units of localized polarizability
output. The default is Angstroms**3, while false
will give Bohr**3. (default=.TRUE.)
ZDO = flag for LCD analysis of a composite wave function,
given in a $VEC group of a van der Waals complex,
within the zero differential overlap approximation.
The MOs are not orthonormalized and the inter-
molecular electron exchange energy is neglected.
In addition, the molecular overlap matrix is printed
out. This is a very specialized option.
(default = .FALSE.)
1
$LOCAL
----- The following keywords can be used to define the
nuclear part of an LCD. They are usually used to
rectify mistakes in the automatic definition
made when MOIDON=.TRUE. The index defining the
LMO number then refers to the reordered list of LMOs.
NMOIJ = array giving the number of nuclei assigned to a
particular LMO.
IJMO = is an array of pairs of indices (I,J), giving
the row (nucleus I) and column (orbital J)
index of the entries in ZIJ and MOIJ.
MOIJ = arrays of integers K, assigning nucleus K as the
site of the Ith charge of LCD J.
ZIJ = array of floating point numbers assigning a
charge to the Ith charge of LCD J.
IPROT = array of integers K, defining nucleus K as a
proton.
DEPRNT = a flag for additional decomposition printing,
such as pair contributions to various energy
terms, and centroids of the Ruedenberg orbitals.
(default = .FALSE.)
----- The following keywords are used to build large EFPs
from several RUNTYP=MAKEFP runs on smaller molecular
fragments, by excluding common regions of overlap.
For example, an EFP for n-octanol can be build from
two MAKEFP runs, on n-pentane and n-pentanol,
CH3CH2CH2CH2-CH2CH2CH2CH2OH
CH3CH2CH2CH2[-CH3]
[CH3]-CH2CH2CH2CH2OH
by excluding operlapping regions shown in brackets
from the two EFPs. See J.Phys.Chem.A 105, 3829-3837,
(2001) for more information.
NOPATM = array of atoms that define an area to be excluded
from a DMA ($STONE) during a RUNTYP=MAKEFP run.
All atomic centers specified, and the midpoints
of any bonds to them, are excluded as expansion
points. The density due to all LMOs primarily
centered on these atoms are excluded from the DMA
(see also KMIDPT). Furthermore, polarizability
tensors for these LMOs are excluded.
KPOINT = array of "boundary atoms", those atoms that are
covalently bonded to the atoms given in NOATM.
1
$LOCAL
KMIDPT = flag to indicate whether the density due to bond
LMOs (and associated expansion points) between
the NOPATM atoms and the KPOINT atoms are to be
included in the DMA. (default = .TRUE.)
NODENS = an array that specifies the atoms for which the
associated electronic density will be removed
before the multipole expansion. This provides an
EFP with net integer charge.
(P.A.Molina, H.Li, J.H.Jensen J.Phys.Chem.B
mss in prep, 2003).
==========================================================
* * * * * * * * * * * * * * * * * *
For hints about localizations, and
the LCD energy decomposition, see
the 'further information' section.
* * * * * * * * * * * * * * * * * *
1
$TWOEI
==========================================================
$TWOEI group (relevant for EDCOMP=.TRUE. in $LOCAL)
Formatted transformed two-electron Coulomb and Exchange
integrals as punched during a LOCAL=RUEDNBRG run. If this
group is present it will automaticall be read in during
such a run and the two-electron integrals do not have to
be re-transformed. This group is especially useful for
EDCOMP=.TRUE. runs when the localization has to be repeated
for different definitions of nuclear LCDs.
1
$TRUNCN
==========================================================
$TRUNCN group (optional, relevant for RHF)
This group controls the truncation of some of the
localized orbitals to just the AOs on a subset of the
atoms. This option is particularly useful to generate
localized orbitals to be frozen when the effective
fragment potential is used to partition a system across a
chemical bond. In other words, this group prepares the
frozen buffer zone orbitals. This group should be used in
conjunction with RUNTYP=ENERGY (or PROP if the orbitals
are available) and either LOCAL=RUEDNBRG or BOYS, with
MOIDON set in $LOCAL.
DOPROJ = flag to activate MO projection/truncation, the
default is to skip this (default=.FALSE.)
AUTOID = forces identification of MOs (analogous to MOIDON
in $LOCAL). This keyword is provided in case the
localized orbitals are already present in $VEC,
in which case this is a faster RUNTYP=PROP with
LOCAL=NONE job. Obviously, GUESS=MOREAD.
(default=.FALSE.)
PLAIN = flag to control the MO tail truncation. A value
of .FALSE. uses corresponding orbital projections,
H.F.King, R.E.Stanton, H.Kim, R.E.Wyatt, R.G.Parr
J. Chem. Phys. 47, 1936-1941(1967) and generates
orthogonal orbitals. A value of .TRUE. just sets
the unwanted AOs to zero, so the resulting MOs
need to go through the automatic orthogonalization
step when MOREAD in the next job. (default=.FALSE.)
IMOPR = an array specifying which MOs to be truncated. In
most cases involving normal bonding, the options
MOIDON or AUTOID will correctly identify all
localized MOs belonging to the atoms in the zone
being truncated. However, you can inspect the
output, and give a list of all MOs which you want
to be truncated in this array, in case you feel
the automatic assignment is incorrect.
Any orbital not in the truncation set, whether
this is chosen automatically or by IMOPR, is left
completely unaltered.
1
- - -
There are now two ways to specify what orbitals are to
be truncated. The most common usage is for preparation of
a buffer zone for QM/MM computations, with an Effective
Fragment Potential representing the non-quantum part of
the system. This input is NATAB, NATBF, ICAPFR, ICAPBF,
in which case the $DATA input must be sorted into three
zones. The first group of atoms are meant to be treated
in later runs by full quantum mechanics, the second
group by frozen localized orbitals as a 'buffer', and the
third group is to be substituted later by an effective
fragment potential (multipoles, polarizabilities, ...).
Note that in the DOPROJ=.TRUE. run, all atoms are still
quantum atoms.
NATAB = number of atoms to be in the 'ab initio' zone.
NATBF = number of atoms to be in the 'buffer' zone.
The program can obtain the number of atoms in
the remaining zone by subtraction, so it need
not be input.
In case the MOIDON or AUTOID options lead to confused
assignments (unlikely in ordinary bonding situations
around the buffer zone), there are two fine tuning values.
ICAPFR = array indicating the identity of "capping atoms"
which are on the border between the ab initio and
buffer zones (in the ab initio zone).
ICAPBK = array indicating the identity of "capping atoms"
which are on the border between the buffer and EFP
zones (in the effective fragment zone).
See also IXCORL and IXLONE below.
- - -
In case truncation seems useful for some other purpose,
you can specify the atoms in any order within the $DATA
group, by the IZAT/ILAT approach. You are supposed to
give only one of these two lists, probably whichever is
shorter:
IZAT = an array containing the atoms which are NOT in
the buffer zone.
ILAT = an array containing the atoms which are in
the buffer zone.
The AO coefficients of the localized orbitals present in
the buffer zone which lie on atoms outside the buffer will
be truncated.
See also IXCORL and IXLONE below.
1
- - -
The next two values let you remove additional orbitals
within the buffer zone from the truncation process, if that
is desirable. These arrays can only include atoms that are
already in the buffer zone, whether this was defined by
NATBF, or IZAT/ILAT. The default is to include all core
and lone pair orbitals, not just bonding orbitals, as the
buffer zone orbitals.
IXCORL = an array of atoms whose core and lone pair
orbitals are to be considered as not belonging
to the buffer zone orbitals.
IXLONE = an array of atoms for which only the lone pair
orbitals are to be considered as not belonging
to the buffer zone orbitals.
- - -
The final option controls output of the truncated orbitals
to file PUNCH for use in later runs:
NPUNOP = punch out option for the truncated orbitals
= 1 the MOs are not reordered.
= 2 punch the truncated MOs as the first vectors
in the $VEC MO set, with untransformed vectors
following immediately after. (default)
==========================================================
1
$ELMOM $ELPOT
==========================================================
$ELMOM group (not required)
This group controls electrostatic moments calculation.
The symmetry properties of multipoles are discussed in
A.Gelessus, W.Thiel, W.Weber
J.Chem.Ed. 72, 505-508(1995)
IEMOM = 0 - skip this property
1 - calculate monopole and dipole (default)
2 - also calculate quadrupole moments
3 - also calculate octopole moments
WHERE = COMASS - center of mass (default)
NUCLEI - at each nucleus
POINTS - at points given in $POINTS.
OUTPUT = PUNCH, PAPER, or BOTH (default)
IEMINT = 0 - skip printing of integrals (default)
1 - print dipole integrals
2 - also print quadrupole integrals
3 - also print octopole integrals
-2 - print quadrupole integrals only
-3 - print octopole integrals only
The quadrupole and octopole tensors on the printout
are formed according to the definition of Buckingham.
Caution: only the first nonvanishing term in the multi-
ipole charge expansion is independent of the coordinate
origin chosen, which is normally the center of mass.
==========================================================
$ELPOT group (not required)
This group controls electrostatic potential calculation.
IEPOT = 0 skip this property (default)
1 calculate electric potential
WHERE = COMASS - center of mass
NUCLEI - at each nucleus (default)
POINTS - at points given in $POINTS
GRID - at grid given in $GRID
PDC - at points controlled by $PDC.
OUTPUT = PUNCH, PAPER, or BOTH (default)
This property is the electrostatic potential V(a) felt
by a test positive charge, due to the molecular charge
density. A nucleus at the evaluation point is ignored.
If this property is evaluated at the nuclei, it obeys the
equation
sum on nuclei(a) Z(a)*V(a) = 2*V(nn) + V(ne).
The electronic portion of this property is called the
diamagnetic shielding.
==========================================================
1
$ELDENS $ELFLDG
==========================================================
$ELDENS group (not required)
This group controls electron density calculation.
IEDEN = 0 skip this property (default)
= 1 compute the electron density.
MORB = The molecular orbital whose electron density is
to be computed. If zero, the total density is
computed. (default=0)
WHERE = COMASS - center of mass
NUCLEI - at each nucleus (default)
POINTS - at points given in $POINTS
GRID - at grid given in $GRID
OUTPUT = PUNCH, PAPER, or BOTH (default)
IEDINT = 0 - skip printing of integrals (default)
1 - print the electron density integrals
==========================================================
$ELFLDG group (not required)
This group controls electrostatic field and electric
field gradient calculation.
IEFLD = 0 - skip this property (default)
1 - calculate field
2 - calculate field and gradient
WHERE = COMASS - center of mass
NUCLEI - at each nucleus (default)
POINTS - at points given in $POINTS
OUTPUT = PUNCH, PAPER, or BOTH (default)
IEFINT = 0 - skip printing these integrals (default)
1 - print electric field integrals
2 - also print field gradient integrals
-2 - print field gradient integrals only
The Hellman-Feynman force on a nucleus is the nuclear
charge multiplied by the electric field at that nucleus.
The electric field is the gradient of the electric
potential, and the field gradient is the hessian of the
electric potential. The components of the electric field
gradient tensor are formed in the conventional way, i.e.
see D.Neumann and J.W.Moskowitz.
==========================================================
1
$POINTS $GRID
==========================================================
$POINTS group (not required)
This group is used to input points at which properties
will be computed. This first card in the group must
contain the string ANGS or BOHR, followed by an integer
NPOINT, the number of points to be used. The next NPOINT
cards are read in free format, containing the X, Y, and Z
coordinates of each desired point.
==========================================================
$GRID group (not required)
This group is used to input a grid (plane through the
molecule) on which properties will be calculated.
ORIGIN(i) = coordinates of the lower left corner of
the plot.
XVEC(i) = coordinates of the lower right corner of
the plot.
YVEC(i) = coordinates of the upper left corner of
the plot.
SIZE = grid increment, default is 0.25.
UNITS = units of the above four values, it can be
either BOHR or ANGS (the default).
Note that XVEC and YVEC are not necessarily parallel to
the X and Y axes, rather they are the axes which you
desire to see plotted by the MEPMAP contouring program.
==========================================================
* * * * * * * * * * * * * * * * * * * *
For conversion factors, and references
see the 'further information' section.
* * * * * * * * * * * * * * * * * * * *
1
$PDC
==========================================================
$PDC group (relevant if WHERE=PDC in $ELPOT)
This group determines the points at which to compute
the electrostatic potential, for the purpose of fitting
atomic charges to this potential. Constraints on the fit
which determines these "potential determined charges" can
include the conservation of charge, the dipole, and the
quadrupole.
PTSEL = determines the points to be used, choose from
GEODESIC to use a set of points on several fused
sphere van der Waals surfaces, with points
selected using an algorithm due to Mark
Spackman. The results are similar to those
from the Kollman/Singh method, but are
less rotation dependent. (default)
CONNOLLY to use a set of points on several fused
sphere van der Waals surfaces, with points
selected using an algorithm due to Michael
Connolly. This is identical to the method
used by Kollman & Singh (see below)
CHELPG to use a modified version of the CHELPG
algorithm, which produces a symmetric
grid of points for a symmetric molecule.
CONSTR = NONE - no fit is performed. The potential at
the points is instead output according
to OUTPUT in $ELPOT.
CHARGE - the sum of fitted atomic charges is
constrained to reproduce the total
molecular charge. (default)
DIPOLE - fitted charges are constrained to
exactly reproduce the total charge
and dipole.
QUPOLE - fitted charges are constrained to
exactly reproduce the charge, dipole,
and quadrupole.
Note: the number of constraints cannot exceed
the number of parameters, which is the number
of nuclei. Planar molecules afford fewer
constraint equations, namedly two dipole
constraints and three quadrupole constraints,
instead of three and five, repectively.
1
* * * the next 5 pertain to PTSEL=GEODESIC or CONNOLLY * * *
VDWSCL = scale factor for the first shell of VDW spheres.
The default of 1.4 seems to be an empirical best
value. Values for VDW radii for most elements up
to Z=36 are internally stored.
VDWINC = increment for successive shells (default = 0.2).
The defaults for VDWSCL and VDWINC will result
in points chosen on layers at 1.4, 1.6, 1.8 etc
times the VDW radii of the atoms.
LAYER = number of layers of points chosen on successive
fused sphere VDW surfaces (default = 4)
NFREQ = flag for particular geodesic tesselation of
points. Only relevant if PTSEL=GEODESIC.
Options are:
(10*h + k) for {3,5+}h,k tesselations
-(10*h + k) for {5+,3}h,k tesselations
(of course both nh and nk must be less than 10,
so NFREQ must lie within the range -99 to 99)
The default value is NFREQ=30 (=03)
PTDENS = density of points on the surface of each scaled
VDW sphere (in points per square au). Only relevant
if PTSEL=CONNOLLY. Default is 0.28 per au squared,
which corresponds to 1.0 per square Angstrom, the
default recommended by Kollman & Singh.
* * * the next two pertain to PTSEL=CHELPG * * *
RMAX = maximum distance from any point to the closest
atom. (default=3.0 Angstroms)
DELR = distance between points on the grid.
(default=0.8 Angstroms)
1
MAXPDC = an estimate of the total number of points whose
electrostatic potential will be included in the
fit. (default=10000)
* * *
CENTER = an array of coordinates at which the moments were
computed.
DPOLE = the molecular dipole.
QPOLE = the molecular quadrupole.
PDUNIT = units for the above values. ANGS (default) will
mean that the coordinates are in Angstroms, the
dipole in Debye, and quadrupole in Buckinghams.
BOHR implies atomic units for all 3.
Note: it is easier to compute the moments in the
current run, by setting IEMOM to at least 2 in
$ELMOM. However, you could fit experimental data,
for example, by reading it in here.
==========================================================
There is no unique way to define fitted atomic
charges. Smaller numbers of points at which the electro-
static potential is fit, changes in VDW radii, asymmetric
point location, etc. all affect the results. A useful
bibliography is
U.C.Singh, P.A.Kollman, J.Comput.Chem. 5, 129-145(1984)
L.E.Chirlain, M.M.Francl, J.Comput.Chem. 8, 894-905(1987)
R.J.Woods, M.Khalil, W.Pell, S.H.Moffatt, V.H.Smith,
J.Comput.Chem. 11, 297-310(1990)
C.M.Breneman, K.B.Wiberg, J.Comput.Chem. 11, 361-373(1990)
K.M.Merz, J.Comput.Chem. 13, 749(1992)
M.A.Spackman, J.Comput.Chem. 17, 1-18(1996)
1
$MOLGRF
==========================================================
$MOLGRF group (relevant only if you have MOLGRAPH)
This option provides an interface for viewing orbitals
through a commercial package named MOLGRAPH, from Daikin
Industries. Note that this option uses three disk files
which are not defined in the GAMESS execution scripts we
provide, since we don't use MOLGRAPH ourselves. You will
need to define files 28, 29, 30, as generic names PRGRID,
COGRID, MOGRID, of which the latter is passed to MOLGRAPH.
GRID3D = a flag to generate 3D grid data.
(default is .false.).
TOTAL = a flag to generate a total density grid data.
"Total" means the sum of the orbital densities
given by NPLT array. (default is .false.).
MESH = numbers of grids. You can use different numbers
for three axes. (default is MESH(1)=21,21,21).
BOUND = boundary coordinates of a 3D graphical cell. The
default is that the cell is larger than the
molecular skeleton by 3 bohr in all directions.
E.g., BOUND(1)=xmin,xmax,ymin,ymax,zmin,zmax
NPLOTS = number of orbitals to be used to generate 3D grid
data. (default is NPLOTS=1).
NPLT = orbital IDs. The default is 1 orbital only, the
HOMO or SOMO. If the LOCAL option is given in
$CONTRL, localized orbital IDs should be given.
For example, NPLT(1)=n1,n2,n3,...
CHECK = debug option, printing some of the grid data.
If you are interested in graphics, look at the WWW page
for information about other graphics packages with GAMESS.
==========================================================
1
$STONE
==========================================================
$STONE group (optional)
This group defines the expansion points for Stone's
distributed multipole analysis (DMA) of the electrostatic
potential.
The DMA takes the multipolar expansion of each overlap
charge density defined by two gaussian primitives, and
translates it from the center of charge of the overlap
density to the nearest expansion point. Some references
for the method are
Stone, Chem.Phys.Lett. 83, 233 (1981)
Price and Stone, Chem.Phys.Lett. 98, 419 (1983)
Buckingham and Fowler, J.Chem.Phys. 79, 6426 (1983)
Stone and Alderton, Mol.Phys. 56, 1047 (1985)
The existence of a $STONE group in the input is what
triggers the analysis. Enter as many lines as you wish,
in any order, terminated by a $END record.
----------------------------------------------------------
ATOM i name, where
ATOM is a keyword indicating that a particular
atom is selected as an expansion center.
i is the number of the atom
name is an optional name for the atom. If not
entered the name will be set to the name
used in the $DATA input.
----------------------------------------------------------
ATOMS is a keyword selecting all nuclei in the
molecule as expansion points. No other
input on the line is necessary.
----------------------------------------------------------
BONDS is a keyword selecting all bond midpoints
in the molecule as expansion points. No
other input on the line is necessary.
----------------------------------------------------------
1
$STONE
----------------------------------------------------------
BOND i j name, where
BOND is a keyword indicating that a bond mid-
point is selected as an expansion center.
i,j are the indices of the atoms defining the
bond, corresponding to two atoms in $DATA.
name an optional name for the bond midpoint.
If omitted, it is set to 'BOND'.
----------------------------------------------------------
CMASS is a keyword selecting the center of mass
as an expansion point. No other input on
the line is necessary.
----------------------------------------------------------
POINT x y z name, where
POINT is a keyword indicating that an arbitrary
point is selected as an expansion point.
x,y,z are the coordinates of the point, in Bohr.
name is an optional name for the expansion
point. If omitted, it is set to 'POINT'.
----------------------------------------------------------
While making the EFPs for QM/MM run, a single keyword
QMMMBUF is necessary. Adding additional keywords may lead
to meaningless results. The program will automatically
select atoms and bond midpoints which are outside the
buffer zone as the multipole expansion points.
QMMMBUF nmo, where
QMMMBUF is a keyword specifying the number of QM/MM
buffer molecular orbitals, which must be the
first NMO orbitals in the MO set. These
orbitals must be frozen in the buffer zone,
so this is useful only if $MOFRZ is given.
NMO is the number of buffer MO-s
(if NMO is omitted, it will be set to the
number of frozen MOs in $MOFRZ)
==========================================================
The second and third moments on the printout can be
converted to Buckingham's tensors by formula 9 of
A.D.Buckingham, Quart.Rev. 13, 183-214 (1959)
These can in turn be converted to spherical tensors
by the formulae in the appendix of
S.L.Price, et al. Mol.Phys. 52, 987-1001 (1984)
1
$RAMAN
==========================================================
$RAMAN group (relevant for all SCFTYPs)
This input controls the computation of Raman intensity
by the numerical differentiation produre of Komornicki and
others. It is applicable to any wavefunction for which
the analytic gradient is available, including some MP2 and
CI cases. The calculation involves the computation of 19
nuclear gradients, one without applied electric fields,
plus 18 no symmetry runs with electric fields applied in
various directions. The numerical second differencing
produces intensity values with 2-3 digits of accuracy.
This run must follow an earlier RUNTYP=HESSIAN job,
and the $GRAD and $HESS groups from that first job must be
given as input. If the $DIPDR is computed analytically
by this Hessian job, it too may be read in, if not, the
numerical Raman job will evaluate $DIPDR. Once the data
from the 19 applied fields is available, the $ALPDR tensor
is evaluated. Then the nuclear derivatives of the dipole
moment and alpha polarizability will be combined with the
normal coordinate information to produce the IR and Raman
intensity of each mode.
To study isotopic substitution speedily, input the
$GRAD, $HESS, $DIPDR, and $ALPDR groups along with the
desired atomic masses in $MASS.
The code does not permit any semi-empirical or solvation
models to be used.
EFIELD = applied electric field strenth. The literature
suggests values in the range 0.001 to 0.005.
(default = 0.002 a.u.)
==========================================================
$ALPDR group (relevant for RUNTYP=RAMAN or HESSIAN)
Formatted alpha derivative tensor, punched by a previous
RUNTYP=RAMAN job. If both $DIPDR and this group are found
in the input file, the applied field computation will be
skipped, to immediately evaluate IR and Raman intensities.
If this group is found during a Hessian job, the Raman
intensities will be added to the output. You might want
to run as RUNTYP=HESSIAN instead of RUNTYP=RAMAN in order
to have access to PROJCT or the other options available in
the $FORCE group.
==========================================================
1
$MOROKM
==========================================================
$MOROKM group (relevant for RUNTYP=MOROKUMA)
This group controls how the supermolecule input in the
$DATA group is divided into two or more monomers. Both
the supermolecule and its constituent monomers must be
well described by RHF wavefunctions.
MOROKM = a flag to request Morokuma-Kitaura decomposition.
(default is .TRUE.)
RVS = a flag to request "reduced variation space"
decomposition. This differs from the Morokuma
option, and one or the other or both may be
requested in the same run. (default is .FALSE.)
BSSE = a flag to request basis set superposition error
be computed. You must ensure that CTPSPL is
selected. This option applies only to MOROKM
decompositions, as a basis superposition error is
automatically generated by the RVS scheme. This
is not the full Boys counterpoise correction, as
explained in the reference. (default is .FALSE.)
* * *
IATM = An array giving the number of atoms in each of
the monomer. Up to ten monomers may be defined.
Your input in $DATA must have all the atoms in
the first monomer defined before the atoms in the
second monomer, before the third monomer... The
number of atoms belonging to the final monomer
can be omitted. There is no sensible default for
IATM, so don't omit it from your input.
ICHM = An array giving the charges of the each monomer.
The charge of the final monomer may be omitted,
as it is fixed by ICH in $CONTRL, which is the
total charge of the supermolecule. The default
is neutral monomers, ICHM(1)=0,0,0,...
EQUM = a flag to indicate all monomers are equivalent
by symmetry (in addition to containing identical
atoms). If so, which is not often true, then only
the unique computations will be done.
(default is .FALSE.)
CTPSPL = a flag to decompose the interaction energy into
charge transfer plus polarization terms. This
is most appropriate for weakly interacting
monomers. (default is .TRUE.)
1
CTPLX = a flag to combine the CT and POL terms into a
single term. If you select this, you might want
to turn CTPSPL off to avoid the extra work that
that decomposition entails, or you can analyze
both ways in the same run (default=.FALSE.)
RDENG = a flag to enable restarting, by reading the
lines containing "FINAL ENERGY" from a previous
run. The $ENERGY group is single lines read
under format A16,F20.10 containing the E, and a
card $END to complete. The 16 chars = anything.
(default is .FALSE.)
==========================================================
The present implementation has some quirks:
1. The initial guess of the monomer orbitals is not
controlled by $GUESS. The program first looks for a
$VEC1, $VEC2, ... group for each monomer. If they
are found, they will be MOREAD. If any of these are
missing, the guess for that monomer will be constructed
by HCORE. Check your monomer energies carefully! The
initial guess orbitals for the supermolecule are formed
by a block diagonal matrix of the monomer orbitals.
2. The use of symmetry is turned off internally.
3. There is no direct SCF option. File ORDINT will be a
full C1 list of integrals. File AOINTS will contain
whatever subset of these is needed for each particular
decomposition step. So extra disk space is needed
compared to RUNTYP=ENERGY.
4. This kind of run applies only to ab initio cases.
5. This kind of run will work in parallel.
6. Spherical harmonics may not be used.
References:
C.Coulson in "Hydrogen Bonding", D.Hadzi, H.W.Thompson,
Eds., Pergamon Press, NY, 1957, pp 339-360.
C.Coulson Research, 10, 149-159 (1957).
K.Morokuma J.Chem.Phys. 55, 1236-44 (1971).
K.Kitaura, K.Morokuma Int.J.Quantum Chem. 10, 325 (1976).
K.Morokuma, K.Kitaura in "Chemical Applications of
Electrostatic Potentials", P.Politzer,D.G.Truhlar, Eds.
Plenum Press, NY, 1981, pp 215-242.
The method coded is the newer version described in the
latter two papers. Note that the CT term is computed
separately for each monomer, as described in the words
below equation 16 of the 1981 paper, not simultaneously.
Reduced Variational Space:
W.J.Stevens, W.H.Fink, Chem.Phys.Lett. 139, 15-22(1987).
1
A comparison of the RVS and Morokuma decompositions can
be found in the review article: "Wavefunctions and
Chemical Bonding" M.S.Gordon, J.H.Jensen in "Encyclopedia
of Computational Chemistry", volume 5, P.V.R.Schleyer,
editor, John Wiley and Sons, Chichester, 1998.
BSSE during Morokuma decomposition:
R.Cammi, R.Bonaccorsi, J.Tomasi
Theoret.Chim.Acta 68, 271-283(1985).
The present implementation:
"Energy decomposition analysis for many-body interactions,
and application to water complexes"
W.Chen, M.S.Gordon J.Phys.Chem. 100, 14316-14328(1996)
1
$FFCALC
==========================================================
$FFCALC group (relevant for RUNTYP=FFIELD)
This group permits the study of the influence of an
applied electric field on the wavefunction. The most
common finite field calculation applies a sequence of
fields to extract the linear polarizability and first and
second order hyperpolarizability. The method is general,
and so works for all ab initio wavefunctions in GAMESS.
EFIELD = applied electric field strength
(default=0.001 a.u.)
IAXIS and JAXIS specify the orientation of the applied
field. 1,2,3 mean x,y,z respectively.
The default is IAXIS=3 and JAXIS=0.
If IAXIS=i and JAXIS=0, the program computes alpha(ii),
beta(iii), and gamma(iiii) from the energy changes, and
a few more components from the dipole changes. Five
wavefunction evaluations are performed.
If IAXIS=i and JAXIS=j, the program computes the cross
terms beta(ijj), beta(iij), and gamma(iijj) from the
energy changes, and a few more components from the
dipole changes. This requires nine evaluations of the
wavefunction.
AOFF = a flag to permit evaluation of alpha(ij)
when the dipole moment is not available.
This is necessary only for MP2, and means
the off-axial calculation will do 13, not
9 energy evaluations. Default=.FALSE.
SYM = a flag to specify when the fields to be
applied along the IAXIS and/or JAXIS (or
according to EONE below) do not break the
molecular symmetry. Since most fields do
break symmetry, the default is .FALSE.
ONEFLD = a flag to specify a single applied field
calculation will be performed. Only the
energy and dipole moment under this field
are computed. If this option is selected,
only SYM and EONE input is heeded. The
default is .FALSE.
EONE = an array of the three x,y,z components of
the single applied field.
There are notes on RUNTYP=FFIELD on the next page.
1
$FFCALC
Finite field calculations require large basis sets,
and extraordinary accuracy in the wavefunction. To
converge the SCF to many digits is sometimes problematic,
but we suggest you use the input to increase integral
accuracy and wavefunction convergence, for example
$CONTRL ICUT=20 ITOL=30 INTTYP=HONDO $END
$SCF CONV=1.0d-10 FDIFF=.FALSE. $END
In many cases, the applied fields will destroy the
molecular symmetry. This means the integrals are
calculated once with point group symmetry to do the
initial field free wavefunction evaluation, and then again
with point group symmetry turned off. If the fields
applied do not destroy symmetry, you can avoid this second
calculation of the integrals by SYM=.TRUE. This option
also permits use of symmetry during the applied field
wavefunction evaluations.
Examples of fields that do not break symmetry are a
Z-axis field for an axial point group which is not
centrosymmetric (i.e. C2v). However, a second field in
the X or Y direction does break the C2v symmetry.
Application of a Z-axis field for benzene breaks D6h
symmetry. However, you could enter the group as C6v in
$DATA while using D6h coordinates, and regain the prospect
of using SYM=.TRUE. If you wanted to go on to apply a
second field for benzene in the X direction, you might
want to enter Cs in $DATA, which will necessitate the
input of two more carbon and hydrogen atom, but recovers
use of SYM=.TRUE.
Reference: H.A.Kurtz, J.J.P.Stewart, K.M.Dieter
J.Comput.Chem. 11, 82-87 (1990).
For analytic computation of static and also frequency
dependent NLO proerties, for closed shell cases, see the
$TDHF group.
==========================================================
1
$TDHF
==========================================================
$TDHF group (relevant for SCFTYP=RHF if RUNTYP=TDHF)
This group permits the analytic calculation of various
static and/or frequency dependent polarizabilities, with
an emphasis on important NLO properties such as second and
third harmonic generation. The method is programmed only
for closed shell wavefunctions, at the semi-empirical or
ab initio level. Ab initio calculations may be direct SCF,
or parallel, if desired.
Because the Fock matrices computed during the time-
dependent Hartree-Fock CPHF are not symmetric, you may not
use symmetry. You must enter NOSYM=1 in $CONTRL!
For a more general numerical approach to the static
properties, see $FFCALC.
NFREQ = Number of frequencies to be used. (default=1)
FREQ = An array of energy values in atomic units. For
example: if NFREQ=3 then FREQ(1)=0.0,0.1,0.25.
By default, only the static polarizabilities are
computed. (default is freq(1)=0.0)
The conversion factor from Hartree to wave
numbers is 219,474.6, and the wavelength is
given (in nm) by 45.56/FREQ.
MAXITA = Maximum number of iterations for an alpha
computation. (default=100)
MAXITU = Maximum number of iterations in the second order
correction calculation. This applies to iterative
beta values and all gammas. (default=100)
ATOL = Tolerance for convergence of first-order results.
(default=1.0d-05)
BTOL = Tolerance for convergence of second-order results.
(default=1.0d-05)
RETDHF = a flag to choose starting points for iterative
calculations from best previous results.
(default=.true.)
1
* * * the following NLO properties are available * * *
INIB = 0 turns off all beta computation (default)
= 1 calculates only noniterative beta
= 2 calculate iterative and noniterative beta
The next flags allow further BETA tuning
BSHG = Calculate beta for second harmonic generation.
BEOPE = Calculate beta for electrooptic Pockels effect.
BOR = Calculate beta for optical rectification.
INIG = 0 turns off all gamma computation (default)
= 1 calculates only noniterative gamma
= 2 calculate iterative and noniterative gamma
The next flags allow further GAMMA tuning
GTHG = Calculate gamma for third harmonic generation.
GEFISH = Calculate gamma for electric-field induced
second harmonic generation.
GIDRI = Calculate gamma for intensity dependent
refractive index.
GOKE = Calculate gamma for optical Kerr effect.
These will be computed only if a nonzero energy is
requested. The default for each flag is .TRUE., and they
may be turned off individually by setting some .FALSE.
Note however that the program determines the best way to
calculate them. For example, if you wish to have the SHG
results but no gamma results are needed, the SHG beta will
be computed in a non-iterative way from alpha(w) and
alpha(2w). However if you request the computation of the
THG gamma, the second order U(w,w) results are needed and
an iterative SHG calculation will be performed whether
you request it or not, as it is a required intermediate.
Reference:
S.P.Karna, M.Dupuis J.Comput.Chem. 12, 487-504 (1991).
P.Korambath, H.A.Kurtz, in "Nonlinear Optical Materials",
ACS Symposium Series 628, S.P.Karna and A.T.Yeates, Eds.
pp 133-144, Washington DC, 1996.
Review: D.P.Shelton, J.E.Rice, Chem.Rev. 94, 3-29(1994).
==========================================================
1
$EFRAG
==========================================================
$EFRAG group (optional)
This group gives the name and position of one or more
effective fragment potentials. It consists of a series of
free format card images, which may not be combined onto a
single line! The position of a fragment is defined by
giving any three points within the fragment, relative to
the ab initio system defined in $DATA, since the effective
fragments have a frozen internal geometry. All other
atoms within the fragment are defined by information in
the $FRAGNAME group.
----------------------------------------------------------
-1- a line containing one or more of these options:
COORD =CART selects use of Cartesians coords
to define the fragment position at
line -3-. (default)
=INT selects use of Z-matrix internal
coordinates at line -3-.
POLMETHD=SCF indicates the induced dipole for
each fragment due to the ab initio
electric field and other fragment
fields is updated only once during
each SCF iteration.
=FRGSCF requests microiterations during
each SCF iteration to make induced
dipoles due to ab initio and other
fragment fields self consistent
amoung the fragments. (default)
Both methods converge to the same
dipolar interaction.
POSITION=OPTIMIZE Allows full optimization within the
ab initio part, and optimization of
the rotational and translational
motions of each fragment. (default)
=FIXED Allows full optimization of the
ab initio system, but freezes the
position of the fragments. This
makes sense only with two or more
fragments, as what is frozen is the
fragments' relative orientation.
=EFOPT the same as OPTIMIZE, but if the
fragment gradient is large, up to
5 geometry steps in which only the
fragments move may occur, before
the geometry of the ab initio piece
is relaxed. This may save time by
reusing the two electron integrals
for the ab initio system.
1
$EFRAG
NBUFFMO = n First n orbitals in the MO matrix
are deemed to belong to the QM/MM
buffer and will be excluded from
the interaction with the EFP region.
This makes sense only if these first
MOs are frozen via the $MOFRZ group.
Note that other parameters in the developing EFP-2 model
are not documented in the $FRAGNAME documentation below.
MXBF = n maximum number of basis functions
in the EFP-2 potential
MXMO = n maximum number of MOs in the EFP-2
potential.
Input a blank line if all the defaults are acceptable.
----------------------------------------------------------
-2- FRAGNAME=XXX
XXX is the name of the fragment whose coordinates are to
be given next. All other information defining the
fragment is given in a supplemental $XXX group, which is
referred to below as a $FRAGNAME group.
Two different water potentials are internally stored.
FRAGNAME=H2OEF2 will select a water potential developed
at the RHF/DZP level, while FRAGNAME=H2ODFT will select
a poential corresponding to B3LYP/DZP (see $BASIS for
the precise meaning of DZP). If you choose one of these
internally stored potentials, you do not need to input
either a $FRAGNAME or $FRGPOL groups.
----------------------------------------------------------
-3- NAME, X, Y, Z (COORD=CART)
NAME, I, DISTANCE, J, BEND, K, TORSION (COORD=INT)
NAME = the name of a fragment point. The name used
here must match one of the points in $FRAGNAME.
For the internally stored H2OEF2 and H2ODFT
potential, the atom names are O1, H2, and H3.
X, Y, Z = Cartesian coordinates defining the position of
this fragment point RELATIVE TO THE COORDINATE
ORIGIN used in $DATA. The choice of units is
controlled by UNITS in $CONTRL.
1
$EFRAG
I, DISTANCE, J, BEND, K, TORSION = the usual Z-matrix
connectivity internal coordinate definition.
The atoms I, J, K must be atoms in the ab
initio system from in $DATA, or fragment points
already defined in the current fragment or
previously defined fragments.
Line -3- must be given a total of three times to define
this fragment's position.
----------------------------------------------------------
Repeat lines -2- and -3- to enter as many fragments as you
desire, and then end the group with a $END line.
Note that it is quite typical to repeat the same fragment
name at line -2-, to use the same fragment system at many
different positions.
==========================================================
* * * * * * * * * * * * * * * * * * * * *
For tips on effective fragment potentials
see the 'further information' section
* * * * * * * * * * * * * * * * * * * * *
1
$FRAGNAME
==========================================================
(required for each FRAGNAME given in $EFRAG)
$FRAGNAME group
This group gives all pertinent information for a given
effective fragment potential (EFP). This information
falls into three categories:
electrostatic (distributed multipoles, screening)
distributed polarizabilities
exchange repulsion
It is input using several different subgroups, which
should be given in the order shown below. Each subgroup
is specified by a particular name, and is terminated by
the word STOP. You may omit any of the subgroups to omit
that term from the EFP. All values are given in atomic
units.
To input monopoles, follow input sequence -EM-
To input dipoles, follow input sequence -ED-
To input quadrupoles, follow input sequence -EQ-
To input octopoles, follow input sequence -EO-
To input screening parameters, follow input sequence -ES-
To input polarizable points, follow input sequence -P-
To input repulsive points, follow input sequence -R-
----------------------------------------------------------
-1- a single descriptive title card
----------------------------------------------------------
-2- COORDINATES
COORDINATES signals the start of the subgroup containing
the multipolar expansion terms (charges, dipoles, ...).
Optionally, one can also give the coordinates of the
polarizable points, or centers of exchange repulsion.
-3- NAME, X, Y, Z, WEIGHT, ZNUC
NAME is a unique string identifying the point.
X, Y, Z are the Cartesian coordinates of the point.
WEIGHT and ZNUC are the atomic mass and nuclear charge,
and are given only for the points which are nuclei.
Typically the true nuclei will appear twice, once for
defining the positive nuclear charge and its screening,
and a second time for defining the electronic distributed
multipoles.
Repeat line -3- for each expansion point, and terminate
the list with a "STOP".
----------------------------------------------------------
1
$FRAGNAME
-EM1- MONOPOLES
MONOPOLES signals the start of the subgroup containing
the electronic and nuclear monopoles.
-EM2- NAME, CHARGE1, CHARGE2
NAME must match one given in the COORDINATES subgroup.
CHARGE1 = electronic monopole at this point.
CHARGE2 = nuclear monopole at this point. Omit or enter
zero if this is a bond midpoint or some other
expansion point that is not a nucleus.
Repeat -EM2- to define all desired charges.
Terminate this subgroup with a "STOP".
----------------------------------------------------------
-ED1- DIPOLES
DIPOLES signals the start of the subgroup containing the
dipolar part of the multipolar expansion.
-ED2- NAME, MUX, MUY, MUZ
NAME must match one given in the COORDINATES subgroup.
MUX, MUY, MUZ are the components of the electronic dipole.
Repeat -ED2- to define all desired dipoles.
Terminate this subgroup with a "STOP".
----------------------------------------------------------
-EQ1- QUADRUPOLES
QUADRUPOLES signals the start of the subgroup containing
the quadrupolar part of the multipolar expansion.
-EQ2- NAME, XX, YY, ZZ, XY, XZ, YZ
NAME must match one given in the COORDINATES subgroup.
XX, YY, ZZ, XY, XZ, and YZ are the components of the
electronic quadrupole moment.
Repeat -EQ2- to define all desired quadrupoles.
Terminate this subgroup with a "STOP".
----------------------------------------------------------
-EO1- OCTUPOLES (note: OCTOPOLES is misspelled)
OCTUPOLES signals the start of the subgroup containing
the octupolar part of the multipolar expansion.
-EO2- NAME, XXX, YYY, ZZZ, XXY, XXZ,
XYY, YYZ, XZZ, YZZ, XYZ
NAME must match one given in the COORDINATES subgroup.
XXX, ... are the components of the electronic octopole.
Repeat -EO2- to define all desired octopoles.
Terminate this subgroup with a "STOP".
----------------------------------------------------------
1
$FRAGNAME
-ES1- SCREEN
SCREEN signals the start of the subgroup containing the
screening terms (A*exp[-B*r**2]) for the distributed
multipoles, which account for charge penetration effects.
-ES2- NAME, A, B
NAME must match one given in the COORDINATES subgroup.
A, B are the parameters of the Gaussian screening term.
Repeat -ES2- to define all desired screening points.
Terminate this subgroup with a "STOP".
----------------------------------------------------------
-P1- POLARIZABLE POINTS
POLARIZABLE POINTS signals the start of the subgroup
containing the distributed polarizability tensors, and
their coordinates.
-P2- NAME, X, Y, Z
NAME gives a unique identifier to the location of this
polarizability tensor. It might match one of the points
already defined in the COORDINATES subgroup, but often
does not. Typically the distributed polarizability
tensors are located at the centroids of localized MOs.
X, Y, Z are the coordinates of the polarizability point.
They should be omitted if NAME did appear in COORDINATES.
The units are controlled by UNITS= in $CONTRL.
-P3- XX, YY, ZZ, XY, XZ, YZ, YX, ZX, ZY
XX, ... are components of the distributed polarizability,
which is not a symmetric tensor. XY means dMUx/dFy, where
MUx is a dipole component, and Fy is a component of an
applied field.
Repeat -P2- and -P3- to define all desired polarizability
tensors, and terminate this subgroup with a "STOP".
----------------------------------------------------------
1
$FRAGNAME
-R1- REPULSIVE POTENTIAL
See also the $FRGRPL input group.
REPULSIVE POTENTIAL signals the start of the subgroup
containing the fitted exchange repulsion potential, for
the interaction between the fragment and the ab initio
part of the system. This term also accounts for charge
transfer effects. The term has the form
N
sum C * exp[-D * r**2]
i i i
-R2- NAME, X, Y, Z, N
NAME may match one given in the COORDINATES subgroup,
but need not. If NAME does not match one of the
known points, you must give its coordinates X, Y, and
Z, otherwise omit these three values. N is the total
number of terms in the fitted repulsive potential.
-R3- C, D
These two values define the i-th term in the repulsive
potential. Repeat line -R3- for all N terms.
Repeat -R2- and -R3- to define all desired repulsive
potentials, and terminate this subgroup with a "STOP".
==========================================================
The entire $FRAGNAME group is terminated by a " $END".
1
$FRGRPL
==========================================================
$FRGRPL group
This group defines the inter-fragment repulsive potential,
which consists primarily of exchange repulsions but also
includes charge transfer. Note that the functional form
used for the fragment-fragment repulsion differs from
that used for the ab initio-fragment repulsion, which is
defined in the $FRAGNAME group. The form of the potential
is
N
sum A * exp[-B * r]
i i i
----------------------------------------------------------
-1- PAIR=FRAG1 FRAG2
specifies which two fragment repulsions are being defined.
$FRAGNAME input for the two names FRAG1 and FRAG2 must
have been given.
----------------------------------------------------------
-2- NAME1 NAME2 A B
*or*
NAME1 NAME2 'EQ' NAME3 NAME4
NAME1 must be one of the "NAME" points defined in the
$FRAG1 group's REPULSION POTENTIAL section. Similarly
NAME2 must be a point from the $FRAG2 group. In addition,
NAME1 or NAME2 could be the keyword CENTER, indicating the
center of mass of the fragment.
A and B are the parameters of the fitted repulsive
potential.
The second form of the input allows equal potential fits
to be used. The syntax implies that the potential between
the points NAME1 and NAME2 should be taken the same as the
potential previously given in this group for the pair of
points NAME3 and NAME4.
If there are NPT1 points in FRAG1, and NPT2 points in
FRAG2, input line -2- should be repeated NPT1*NPT2 times.
Terminate the pairs of potentials with a "STOP" card.
Any pairs which you omit will be set to zero interaction.
Typically the number of points on which fitted potentials
might be taken to be all the nuclei in a fragment, plus
the center of mass.
----------------------------------------------------------
Repeat lines -1- and -2- for all pairs of fragments, then
terminate the group with a $END line.
==========================================================
1
$PRTEFP
==========================================================
$PRTEFP group (optional)
This group provides control for generating integer
charge EFP fragments for constructing large EFPs. See
P.A.Molina, H.Li, J.H.Jensen J.Phys.Chem.B (2002) mss in
preparation.
This group is mainly used in RUNTYP=MAKEFP runs. However,
in MOPAC RUNTYP=ENERGY runs, the presence of a $PRTEFP
group causes AM1 or PM3 charges to be printed and
punched out in a suitable format for EFP calculations.
NOPRT = an array specifying the atoms for which EFP
multipole and polarizability points will not be
printed/punched out.
Example: For a molecule with the connectivity
A1-A2-A3-A4-A5, NOPRT(1)=4,5 means that multipoles
centered on atoms 4 and 5, and bond midpoints BO34
and BO45 are not part of the EFP.
MIDPRT = an array specifying atoms whose bond midpoints
neglected by using NOPRT should be printed out.
Example: MIDPRT(1)=3 forces the printout of bond
midpoint BO34.
The neglect of monopoles leads to EFPs with
overall non-integer charge. The next keyword
defines "collection points" to which the removed
monopoles are added. Thus, the net charge of the
EFP=ICHARG. The presence of this "fictitious"
charge is compensated for by adding an opposing
dipole to the collection point.
NUMFFD = an array that defines (1) a collection point,
(2) the number of atoms contributing to monopoles
to this point, and (3) the numbers of the atoms.
More than one collection point can be defined.
An opposing dipole is calculated as -0.5Q*r (Q =
sum of neglected monopoles, r = distance between
collection point and nearest neglected monopole)
and placed at the collection point.
Example: NUMFFD(1)=3,2,4,5. The sum of monopoles
at A4, A5, BO34 and BO45 (Q) is added to the A3
monopole. A dipole, -0.5Q*r, is placed on A3,
where r is the distance between A3 and BO34.
If MIDPRT(1)=3, Q does not include the BO34
monopole, r is the distance between BO34 and A4,
and the resulting dipole is centered on BO34.
==========================================================
1
$DAMP
==========================================================
$DAMP group (optional, relevant if RUNTYP=MAKEFP)
This group provides control over the screening of the
distributed multipole expansion used by the EFP model for
the electrostatic interaction, to account for charge
penetration. See M.A.Freitag, M.S.Gordon, J.H.Jensen,
W.A.Stevens, J.Chem.Phys. 112, 7300-7306(2000). The
screening exponents are optimized by fitting a damped
multipolar electrostatic potential to the actual quantum
mechanical potential of the wavefunction. The fit is done
on a Cartesian grid lying between inner and outer spheres
on each atom.
Two different damping functions can be generated. The
first contains a single exponential form (1 - exp(a*r))
where a varies, and initial guess values for a are given
in $DAMPGS. The second function is a single Gaussian
form, (1 - b*exp(-a*r**2)) where the initial values for a
are taken from a STO-1G fit to the final values of the
exponential fit. The exponential fit is used for fragment-
fragment charge penetration screening, while the Gaussian
fit is used in ab initio-fragment screening. See equations
28 and 4 in the reference.
If $DAMP is not given, the rather time consuming
screening fit is skipped, while giving an empty $DAMP is
sufficient to trigger the fitting.
IFTTYP = 2 means generate an exponential fit, for use as
SCREEN2 input in $FRAGNAME.
= 0 means generate a Gaussian fit, for use as
SCREEN input in $FRAGNAME.
The default is to do both fits, IFTTYP(1)=2,0.
IFTFIX = 0 means the coefficients in the fit (b) are
free parameters
1 means the coefficients are held to unity.
In case the linear coefficients become large,
and particularly if they are negative, a fit
with unit coefficients is more reasonable.
The default is IFTFIX(1)=1,0.
VDWRAD = an array of van der Waals radii for each atom in
the molecule. Defaults are taken from Emsley's
yellow book, "The Elements" so are not built in
for exotic elements like transition metals.
RMIN1 = the minimum radius scale factor for each atom, for
the Gaussian fitting steps. (default=0.67)
RMAX1 = the maximum radius scale factor for each atom, for
the Gaussian fitting steps. (default=3.00)
1
$DAMP $DAMPGS
RMIN2 = the minumum radius scale factor for each atom, for
the exponential fittings. The reference paper
suggests use of 67% of the van der Waals radius.
(default=0.67)
RMAX2 = the maximum radius scale factor for each atom, for
the exponential fittings. The reference paper
suggests use of 300% of the van der Waals radius.
(default=3.00)
XGRID = spacing between grid points (default = 0.5 a.u.)
MAXIT = maximum number of iterations in the fitting step.
The default is 10000.
THRSH = printing threshold for large deviations. The
default is 4.0 kcal/mol.
==========================================================
$DAMPGS group (relevant if $DAMP was given)
This is a free-format, line by line input group that
sets the initial values (guess) for the first damping
function used to screen the multipole expansion. The
initial guess for the second fit will be taken from the
final values of the first fit.
Each multipole expansion point (typically all atoms
followed by all bond midpoints) should receive a value.
A check run may be helpful in listing the names of the
expansion points that are chosen by MAKEFP jobs.
----------------------------------------------------------
-1-
'EQ'
This line gives the name of the expansion point, and how
many terms are in the damping function. You must enter 1
for the number of terms. The second form of this line lets
you equate the current point to some previous point's
values in $DAMPGS, skipping line -2-.
----------------------------------------------------------
-2-
The linear coefficient and exponent of this term in the
damping function. Repeat input for -2- times.
You must enter the coefficient as 1.0 at the present.
If the integer is omitted or given as 0, the
exponents are optimized, but entering 1 freezes these.
----------------------------------------------------------
Repeat -1- and -2- until all multipole centers receive
their initial guess parameters.
==========================================================
1
$PCM
==========================================================
$PCM group (optional)
This group controls solvent effect computations using
the Polarizable Continuum Model. If this group is found
in the input file, a PCM computation is performed. The
default calculation, chosen by selecting only the SOLVNT
keyword, is to compute the electrostatic free energy.
Appropriate numerical constants are provided for a wide
range of solvents. Additional keywords allow for more
sophisticated computations, namely cavitation, repulsion,
and dispersion free energies. The methodology for these
is general, but only numerical constants for water are
provided. There is additional information on PCM in the
References chapter of this manual.
PCM is programmed only for RHF and MCSCF wavefunctions.
Tight geometry optimization with PCM might not be able
to converge to the OPTTOL values below the default $STATPT.
Use of GEPOL-RT tesselation may result in crisper geometry
convergence at some cost in machine time, see $TESCAV.
--- the first set of parameters controls the computation:
IEF, ICOMP, ICAV, IDISP, IREP, IDP, and IFIELD.
IEF switch to choose the type of PCM model used.
= 0 isotropic dielectrics using D-PCM
= 1 anisotropic dielectrics using IEF PCM, see $IEFPCM
= 2 ionic solutions using IEF PCM, see $IEFPCM
= 3 isotropic dielectrics using IEF PCM with matrix
inversion solver, see IEFPCM
= -3 isotropic dielectric IEF PCM with iterative solver,
see $PCMITR. Note that IEF=-3 usually reproduces
the energy of IEF=3 to within 1.0d-5 Hartrees,
but is much faster for large molecules.
= 10 conductor-like PCM (C-PCM) with matrix inversion.
charge scaling factor=(Eps-1.0)/Eps
=-10 C-PCM, with iterative solver. See $PCMITR.
The default is 3 for energy calculations, but -3 for gradients.
The value of IPCDER in $PCMGRD controlling the gradient
computational method is related to IEF, according to
IEF= 3 may choose only IPCDER=0,1
IEF=-3 may choose from IPCDER=0,1,2
The behaviour of PCM prior to Oct. 2000 can be recovered
by selecting IEF=0 and ICOMP=2. Options IEF=1 or 2 are
incompatible with gradients and also must choose ICOMP=0.
IEF=3 may not choose ICOMP=3, but if diffuse functions
are in use, this IEF choice may benefit from ICOMP=2.
The D-PCM method (IEF=0) should normally choose ICOMP=2.
*** at the present time, there is a bug with IEF=1 or 2.
1
$PCM
ICOMP = Compensation procedure for induced charges.
Gradient runs require ICOMP be 0 or 2 only.
= 0 No. (default)
= 1 Yes, each charge is corrected in proportion
to the area of the tessera to which it belongs.
= 2 Yes, using the same factor for all tesserae.
= 3 Yes, with explicit consideration of the
portion of solute electronic charge outside
the cavity, by the method of Mennucci and
Tomasi. See the $NEWCAV group.
ICAV = At the end of the run, calculate the cavitation
energy, by the method of Pierotti and Claverie:
= 0 skip the computation (default)
= 1 perform the computation.
If ICAV=1, the following parameter is relevant:
TABS = the absolute temperature, in units K.
(default=298.0)
There are two procedures for the calculation
of the repulsion and dispersion free energy.
IDISP is incompatible with IREP and IDP.
IDISP = Calculation of both dispersion and repulsion
free energy through the empirical method of
Floris and Tomasi.
= 0 skip the computation (default)
= 1 perform the computation. See $DISREP group.
The next two options add repulsive and dispersive terms
to the solute hamiltonian, in an ab initio manner, by
the method of Amovilli and Mennucci.
IREP = Calculation of repulsion free energy
= 0 skip the computation (default)
= 1 perform the computation. See $NEWCAV group.
IDP = Calculation of dispersion free energy
= 0 skip the computation (default)
= 1 perform the computation. See $DISBS group.
If IDP=1, then three additional parameters must be
defined. The two solvent values correspond to water,
and therefore these must be input for other solvents.
WA = solute average transition energy. This is
computed from the orbital energies for RHF,
but must be input for MCSCF runs.
(default=1.10)
WB = ionization potential of solvent, in Hartrees.
(default=0.451)
ETA2 = square of the zero frequency refractive index
of the solvent. (default=1.75)
1
$PCM
IFIELD = At the end of a run, calculate the electric
potential and electric field generated by the
apparent surface charges.
= 0 skip the computation (default)
= 1 on nuclei
= 2 on a planar grid
If IFIELD=2, the following data must be input:
AXYZ,BXYZ,CXYZ = each defines three components of the
vertices of the plane where the reaction
field is to be computed (in Angstroms)
A ===> higher left corner of the grid
B ===> lower left corner of the grid
C ===> higher right corner of the grid
NAB = vertical subdivision (A--B edge) of the grid
NAC = horizontal subdivision (A--C edge) of the grid.
--- the next group of keywords defines the solvent
SOLVNT = keyword naming the solvent of choice. The eight
numerical constants defining the solvent are
internally stored for the following:
WATER (or H2O)
CH3OH C2H5OH
CLFORM (or CHCl3) CTCL (or CCl4)
METHYCL (or CH2Cl2) 12DCLET (or C2H4Cl2)
BENZENE (or C6H6) TOLUENE (or C6H5CH3)
CLBENZ (or C6H5Cl) NITMET (or CH3NO2)
NEPTANE (or C7H16) CYCHEX (or C6H12)
ANILINE (or C6H5NH2) ACETONE (or CH3COCH3)
THF DMSO (or DMETSOX)
The default solvent name is "INPUT" which indicates
you are giving the following 8 numerical values:
RSOLV = the solvent radius, in units Angstrom
EPS = the dielectric constant
EPSINF = the dielectric constant at infinite frequency.
This value must be given only for RUNTYP=TDHF,
if the external field frequency is in the optical
range and the solvent is polar; in this case the
solvent response is described by the electronic
part of its polarization. Hence the value of the
dielectric constant to be used is that evaluated
at infinite frequency, not the static one (EPS).
For nonpolar solvents, the difference between
the two is almost negligible.
TCE = the thermal expansion coefficient, in units 1/K
VMOL = the molar volume, in units ml/mol
STEN = the surface tension, in units dyne/cm
DSTEN = the thermal coefficient of log(STEN)
CMF = the cavity microscopic coefficient
Values for TCE, VMOL, STEN, DSTEN, CMF need to be given
only for the case ICAV=1. Input of any or all of these
values will override the internally stored value.
1
$PCM
--- the next set of keywords defines the molecular cavity
NESFP = the number of initial spheres.
(default = number of atoms in solute molecule)
ICENT = option for definition of initial spheres.
= 0 centers spheres on each nucleus. (default)
= 1 sphere centers XE, YE, ZE and radii RIN will be
specified explicitly in $PCMCAV.
The cavity generation algorithm may use additional
spheres to smooth out sharp grooves, etc. The
following parameters control how many extra spheres
are generated:
OMEGA and FRO = GEPOL parameters for the creation of the
'added spheres' defining the solvent accessible
surface. When an excessive number of spheres is
created, which may cause problems of convergence,
the value of OMEGA and/or FRO must be increased.
For example, OMEGA from 40 to 50 ... up to 90,
FRO from 0.2 ... up to 0.7.
(defaults are OMEGA=40.0, FRO=0.7)
RET = minimum radius (in A) of the added spheres.
Increasing RET decreases the number of added
spheres. A value of 100.0 (default) inhibits the
addition of any spheres, while 0.2 fills in many.
IPRINT = 0 normal printing (default)
= 1 turns on debugging printout
==========================================================
1
$PCMGRD
==========================================================
$PCMGRD group (optional)
This group controls the PCM gradient computations.
IPCDER = selects different methods for PCM gradients
= 0 fixed-cavity approximation
Implemented only for C-PCM and IEF-PCM
1 use Ux(q) approximation (C-PCM and IEF-PCM)
or use charge-derivative method (D-PCM).
This is the default for D-PCM
2 Variable-Tessera-Number Approximation
Implemented only for C-PCM and IEF-PCM, and
the default for both of these.
note: If ICAV = 1 or IDISP = 1 in $PCM, the derivatives
of the cavitation energy or dispersion-repulsion,
respectively, will automatically be calculated.
These particular steps are evaluated numerically.
IFAST = Controls the PCM calculations for RUNTYP=OPTIMIZE.
0 update PCM charges at each SCF cycle at every
geometry (default)
1 update PCM charges at each SCF cycle for the
initial geometry.
For the subsequent geometries, calculate PCM
charges at the first SCF cycle and use the PCM
charges for the following SCF cycles; after
the density change falls below DENTOL, update
the PCM charges one time (to save CPU time).
==========================================================
1
$PCMCAV
==========================================================
$PCMCAV group (optional)
This group controls generation of the cavity holding
the solute during Polarizable Continuum Model runs.
The cavity is a union of spheres, according to ICENT and
associated input values given in $PCM. The data given
here must be given in Angstrom units.
XE,YE,ZE = arrays giving the coordinates of the spheres.
if ICENT=0, the atomic positions will be used.
if ICENT=1, you must supply NESFP values here.
RADII = VANDW selects van der Waals radii (Angstrom),
which is the default. VDW radii for atoms
H,He, B,C,N,O,F,Ne, Na,Al,Si,P,S,Cl,Ar,
K,As,Se,Br,Kr, Rb,Sb,Te,I, Cs,Bi
are internally tabulated, for others give RIN.
= VDWEFP, similar to VANDW, except that radii not
tabulated by VANDW are assigned as 1.60A.
This option is most useful for protein-EFP
calculations.
= SUAEFP, the simplified united atomic radii will be
be used for the array RIN, namely
H:0.01 C:1.77 N:1.68 O:1.59 P:2.10 S:2.10
For the other elements with Z<16, 1.50 will be used.
For the elements with Z>16, 2.30 will be applied.
This is for the purpose of protein EFP calculations
note: Radii explicitly defined with RIN will overwrite the
defaults selected by VANDW, VDWEFP, or SUAEFP.
RIN = an array giving the sphere radii.
if ICENT=0, the program will look up the internally
data according to the RADII keyword.
if ICENT=1, give NESFP values.
ALPHA = an array of scaling factors, for the definition of
the solvent accessible surface. If only the first
value is given, all radii are scaled by the same
factor. (default is ALPHA(1)=1.2)
Example: Suppose the 4th atom in your molecule is Fe, but
all other atoms have van der Waals radii. You
decide a good guess for Fe is twice the covalent
radius: $PCMCAV RIN(4)=2.33 $END
The source for the van der Waals radii is "The Elements",
2nd Ed., John Emsley, Clarendon Press, Oxford, 1991,
except that for C,N,O, the U.Pisa's experience with the
best radii for PCM treatment of singly bonded C,N,O atoms
is used instead. The radii for a few transition metals
are given by A.Bondi, J.Phys.Chem. 68, 441-451(1964).
==========================================================
1
$TESCAV
==========================================================
$TESCAV group (optional)
This group controls the tessellation procedure for the
molecular surface in the PCM computations. The default
values for this group will normally be satisfactory. To
converge to smaller OPTTOL values may take a high density
of tessera on the cavity surface:
MTHALL=3 NTSALL=960 AREATL=0.0010 BONDRY=1000.0
This set of options may require raising the maximum number
of tessera, MXTS in the source code (see PROG.DOC). It
is reasonable to try just MTHALL=3 first, as this may be
sufficient w/o increasing the tessera density. See also
IFAST=1 in $PCMGRD.
--- The first two arrays control the density of tesserae
and the method to generate the tesserae.
INITS = array defines the initial number of tesserae for
each sphere. Only 60, 240 and 960 are allowed,
but the value can be different for each sphere.
(Default=60 for all spheres)
METHOD = array defining the tessellation method for each
sphere. Only 1 and 3 are allowed, but the value
can be different for each sphere. The default
is 1 for all spheres.
= 1 GEPOL-GB, "Gauss-Bonet" tesselation
3 GEPOL-RT, "regular tesselation".
--- The next three parameters are presets for filling the
arrays INITS and METHOD
NTSALL = 60, 240 or 960 (default = 60)
All values in the array INITS are set to NTSALL
MTHALL = 1 or 3 (default = 1)
All values in the array METHOD are set to MTHALL
MTHAUT = 0 or 1 (default = 0)
If RUNTYP=OPTIMIZE and frozen atoms are defined
by IFCART, MTHAUT=1 will select METHOD=1 for
frozen atoms. See also AUTFRE and NTSFRZ
note: Explicitly defining INITS and METHOD from the input
deck will overrule the presets from NTSALL, MTHALL
and/or MTHAUT.
--- The following two parameters control GEPOL-RT
AREATL = The area criterion (A*A) for GEPOL-RT.
Tesserae with areas < AREATL at the boundary of
intersecting spheres will be neglected.
Default=0.010 A*A. Smaller AREATL cause larger
number of tesserae. AREATL < 0.00010 is not
recommended.
1
$TESCAV $NEWCAV
BONDRY = Controls (by scaling) the distance within which
tesserae are considered "close" to the boundary.
Such tesserae will be recursively divided into
smaller ones until their areas are < AREATL.
The default (= 1.0) means the distance is the
square root of the tessera area.
A large BONDRY value like 1000.0 will lead to
fine tessellation for the entire surface with
all tessera areas < AREATL.
--- The next two parameters are only relevant if MTHAUT=1
AUTFRE = Distance (A) for frozen atoms to be treated as
moving atoms when MTHAUT=1. Default=2.0 A.
NTSFRZ = 60, 240 OR 960, initial tessera number for
frozen atoms. Default=60
==========================================================
$NEWCAV group (optional)
This group controls generation of the "escaped charge"
cavity, used when ICOMP=3 or IREP=1 in $PCM. This cavity
is used only to calculate the fraction of the solute
electronic charge escapes from the original cavity.
IPTYPE = choice for tessalation of the cavity's spheres.
= 1 uses a tetrahedron
= 2 uses a pentakisdodecahedron (default)
ITSNUM = m, the number of tessera to use on each sphere.
if IPTYPE=1, input m=30*(n**2), with n=1,2,3 or 4
if IPTYPE=2, input m=60*(n**2), with n=1,2,3 or 4
(default is 60)
*** the next three parameters pertain to IREP=1 ***
RHOW = density, relative to liquid water (default = 1.0)
PM = molecular weight (default = 18.0)
NEVAL = number of valence electrons on solute (default=8)
The defaults for RHOW, PM, and NEVAL correspond to water,
and therefore must be correctly input for other solvents.
==========================================================
1
$IEFPCM
==========================================================
$IEFPCM group (optional)
This group defines data for the integral equation
formalism version of PCM solvation. It includes special
options for ionic or anisotropic solutions.
The next two sets are relevant only for anisotropic
solvents, namely IEF=1:
EPS1, EPS2, EPS3 =
diagonal values of the dielectric permittivity
tensor with respect to the laboratory frame.
The default is EPS in $PCM
EUPHI, EUTHE, EUPSI =
Eulerian angles which give the rotation of the
solvent orientation with respect to the lab frame.
The term lab frame means $DATA orientation.
The default for each is zero degrees.
The next two are relevant to ionic solvents, namely IEF=2:
EPSI = the ionic solutions's dielectric, the default is
EPS from $PCM.
DISM = the ionic strength, in Molar units (mol/dm**3)
The default is 0.0
==========================================================
1
$PCMITR
==========================================================
$PCMITR group (optional, for IEF=-3 in $PCM)
This group provides control over the iterative
isotropic IEF-PCM calculation. See
C.S.Pomelli, J.Tomasi, V.Barone
Theoret.Chem.Acc. 105, 446-451(2001)
H.Li, C.S.Pomelli, J.H.Jensen
Theoret.Chem.Acc. 109, 71-84(2003)
MXDIIS = Maximum size of the DIIS linear equations, the
value impacts the amount of memory used by PCM.
Memory=2*MXDIIS*NTS, where NTS is the number of
tesserae. MXDIIS=0 means no DIIS, instead the
point Jacobi iterative method will be used.
(Default=50)
MXITR1 = Maximum number of iters in phase 1. (Default=50)
MXITR2 = Maximum number of iters in phase 2. (Default=50)
note: if MXDIIS is larger than both MXITR1 and MXITR2
MXDIIS will be reset to be the larger of these two.
THRES = Convergence threshold for the PCM Apparent
Surface Charges (ASC). (Default=1.0D-08)
THRSLS = Loose threshold used in the early SCF cycles when
the density change is above DENSLS. If THRSLS <
THRESH, this option is turned off.
Default is 5.0D-04.
DENSLS = If the density change is above DENSLS the loose
threshold THRSLS applies. (Default = 0.01 au)
IDIRCT = 1, Directly compute the electronic potential at
each tessera and the ASC potential at the
electronic coordinates, with no disk storage.
(Default)
0, Compute and save above data to hard disk.
Keywords for region wise multipole expansion of ASCs
in approximating interaction among tesserae:
(C.S.Pomelli, J.Tomasi THEOCHEM 537, 97-105(2001))
IMUL = Region wise multipole expansion order in the
approximate interaction among tesserae.
= 0, Neglected (Only for test purposes)
= 1, Monopole
= 2, Monopole+Dipole
= 3, Monopole+Dipole+Quadrupole (Default)
1
$PCMITR
RCUT1 = Cutoff radius (Angstrom) for mid-range
interactions among tesserae. Default=15.0 A
If RCUT1 is larger than your molecule, the
option is effectively turned off.
RCUT2 = Cutoff radius (Angstrom) for long range
interactions among tesserae. Default=30.0 A
The remaining keywords apply only to PCM calculations with
a QM/EFP solute (see Li et al.)
Keywords for region wise multipole expansion of ASCs
in approximating interaction between ASCs and QM region:
IMGASC = 1, Use region wise multipole expansion of ASCs
to compute the ASC potential at QM region.
0, no use of the multipole expansion method.
(default)
RASC = Cutoff radius (Angstrom) for used of the IMGASC
multipole expansion (Default=20.0 A)
Keywords for multipole expansion of the QM region in
approximating the QM region potential:
IMGABI = 0, multipole expansion of the QM region is turned
off (default).
1, turn multipole expansion of the QM region on.
RABI = Cutoff radius (Angstrom) for used of the IMGABI
multipole expansion (Default=4.0 A)
Keywords for the coupling of PCM and EFP polarizability
tensors:
IEFPOL = 1, PCM ASCs induce EFP dipoles.(default)
0, PCM ASCs do not induce EFP dipoles.
REFPOL = When IEFPOL=1, if the distance (Angstrom) between
a polarizability point and a tessera is less than
REFPOL, they are considered too close and the
field from the tessera will not induce dipole for
the polarizability point. Default=0.0 A means
always induce the dipole.
==========================================================
1
$DISBS
==========================================================
$DISBS group (optional)
This group defines auxiliary basis functions used to
evaluate the dispersion free energy by the method of
Amovilli and Mennucci. These functions are used only for
the dispersion calculation, and thus have nothing to do
with the normal basis given in $BASIS or $DATA. If the
input group is omitted, only the normal basis is used for
the IDP=1 dispersion energy.
NADD = the number of added shells
XYZE = an array giving the x,y,z coordinates (in bohr)
of the center, and exponent of the added shell,
for each of the NADD shells.
NKTYPE = an array giving the angular momenta of the shells
An example placing 2s,2p,2d,1f on one particular atom,
$DISBS NADD=7 NKTYP(1)= 0 0 1 1 2 2 3
XYZE(1)=2.9281086 0.0 .0001726 0.2
2.9281086 0.0 .0001726 0.05
2.9281086 0.0 .0001726 0.2
2.9281086 0.0 .0001726 0.05
2.9281086 0.0 .0001726 0.75
2.9281086 0.0 .0001726 0.2
2.9281086 0.0 .0001726 0.2 $END
==========================================================
1
$DISREP
==========================================================
$DISREP group (optional)
This group controls evaluation of the dispersion and
repulsion energies by the empirical method of Floris and
Tomasi. The group must be given with IDISP=1 in $PCM.
The two options are controlled by ICLAV and ILJ, only one
of which should be selected.
ICLAV = selects Claverie's disp-rep formalism.
= 0 skip computation.
= 1 Compute the solute-solvent disp-rep interaction
as a sum over atom-atom interactions through a
Buckingham-type formula (R^-6 for dispersion,
exp for repulsion). (default)
Ref: Pertsin-Kitaigorodsky "The atom-atom
potential method", page 146.
ILJ = selects a Lennard-Jones formalism.
= 0 skip computation. (default)
= 1 solute atom's-solvent molecule interaction is
modeled by Lennard-Jones type potentials, R^-6
for dispersion, R^-12 for repulsion).
---- the following data must given for ICLAV=1:
RHO = solvent numeral density
N = number of atom types in the solvent molecule
NT = an array of the number of atoms of each type in a
solvent molecule
RDIFF = distances between the first atoms of each type
and the cavity
DKT = array of parameters of the dis-rep potential for
the solvent
RWT = array of atomic radii for the solvent
The defaults are chosen for water,
RHO=3.348D-02
N=2
NT(1)=2,1
RDIFF(1)=1.20,1.50
DKT(1)=1.0,1.36
RWT(1)=1.2,1.5
DKA = array of parameters of the dis-rep potential for
the solute. Defaults are provided for some common
elements:
H: 1.00 Be: 1.00 B: 1.00 C: 1.00
N: 1.10 O: 1.36 P: 2.10 S: 1.40
1
RWA = array of atomic radii for the solute to compute
dis-rep. Defaults are provided for some common
elements:
H: 1.20 Be: 1.72 B: 1.72 C: 1.72
N: 1.60 O: 1.50 P: 1.85 S: 1.80
Other elements have DKA and RWA values of 0.0 and must be
given in the input deck, or the DIS-REP energy will be 0.
For EFP/PCM calculations, only QM atoms need DKA and RWA
values to calculate the DIS-REP energy.
---- the following data must given for ILJ=1:
RHO = solvent numeral density
EPSI = an array of energy constants referred to each atom
of the solute molecule.
SIGMA = an array of typical distances, relative to each
solute atom
==========================================================
1
$COSGMS $SCRF
==========================================================
$COSGMS group (optional)
The presence of this group in the input turns on the
use of the conductor-like screening model with molecular
shaped cavity for RHF and closed shell MP2. For RHF, the
energy and gradient can be computed, while MP2 is limited
to the energy only.
EPSI = the dielectric constant, 80 is often used for H2O
This parameter must be given.
RSOLV = the multiplicative factor for the van der Waals
radius used for cavity construction.
(default=1.2)
NSPA = the number of surface points on each atomic
sphere that form the cavity. (default=92)
Additional information on the COSMO model can be
found in the References chapter of this manual.
==========================================================
$SCRF group (optional)
The presence of this group in the input turns on the
use of the Kirkwood-Onsager spherical cavity model for the
study of solvent effects. The method is implemented for
RHF, UHF, ROHF, GVB and MCSCF wavefunctions and gradients,
and so can be used with any RUNTYP involving the gradient.
The method is not implemented for MP2, CI, any of the
semiempirical models, or for analytic hessians.
DIELEC = the dielectric constant, 80 is often used for H2O
RADIUS = the spherical cavity radius, in Angstroms
G = the proportionality constant relating the solute
molecule's dipole to the strength of the reaction
field. Since G can be calculated from DIELEC and
RADIUS, do not give G if they were given.
Additional information on the SCRF model can be
found in the References chapter of this manual.
==========================================================
1
$ECP
==========================================================
$ECP group (required if ECP=READ in $CONTRL)
This group lets you read in effective core potentials,
for some or all of the atoms in the molecule. You can
use built in potentials for some of the atoms if you like.
This is a free format (positional) input group.
*** Give a card set -1-, -2-, and -3- for each atom ***
-card 1- PNAME, PTYPE, IZCORE, LMAX+1
PNAME is a 8 character descriptive tag for this potential.
If it is repeated for a subsequent atom, no other
information need be given on this card, and cards
-2- and -3- may also be skipped. The information
will be copied from the first atom by this PNAME.
Do not use the option to repeat the previously read
ECP for an atom with PTYPE=NONE, instead type "NONE"
over and over again.
PTYPE = GEN a general potential should be read.
= SBKJC look up the Stevens/Basch/Krauss/Jasien/
Cundari potential for this type of atom.
= HW look up the Hay/Wadt built in potential
for this type of atom.
= NONE treat all electrons on this atom.
IZCORE is the number of core electrons to be removed.
Obviously IZCORE must be an even number, or in other
words, all core orbitals being removed must be
completely occupied.
LMAX is the maximum angular momentum occupied in the
core orbitals being removed (usually). Give
IZCORE and LMAX only if PTYPE is GEN.
*** For the first occurence of PNAME, if PTYPE is GEN, ***
*** then give cards -2- and -3-. Otherwise go to -1-. ***
*** Card sets -2- and -3- are repeated LMAX+1 times ***
The potential U(LMAX+1) is given first,
followed by U(L)-U(LMAX+1), for L=1,LMAX.
-card 2- NGPOT
NGPOT is the number of Gaussians in this part of the
local effective potential.
-card 3- CLP,NLP,ZLP (repeat this card NGPOT times)
CLP is the coefficient of this Gaussian in the potential.
NLP is the power of r for this Gaussian.
ZLP is the exponent of this Gaussian.
1
$ECP
Note that PTYPE lets you to type in one or more atoms
explicitly, while using built in data for other atoms.
By far the easiest way to use the SBKJC potential for all
atoms in the formic acid molecule is to request ECP=SBKJC
in $CONTRL. But here we show two alternatives.
The first way is to look up the program's internally
stored SBKJC potentials one atom at a time:
$ECP
C-ECP SBKJC
H-ECP NONE
O-ECP SBKJC
O-ECP
H-ECP NONE
$END
The second oxygen duplicates the first, no core electrons
are removed on hydrogen. The order of the atoms must
follow that generated by $DATA. All atoms must be given
here in $ECP, not just the symmetry unique atoms.
The second example reads all SBKJC potentials explicitly:
$ECP
C-ECP GEN 2 1
1 ----- CARBON U(P) -----
-0.89371 1 8.56468
2 ----- CARBON U(S)-U(P) -----
1.92926 0 2.81497
14.88199 2 8.11296
H-ECP NONE
O-ECP GEN 2 1
1 ----- OXYGEN U(P) -----
-0.92550 1 16.11718
2 ----- OXYGEN U(S)-U(P) -----
1.96069 0 5.05348
29.13442 2 15.95333
O-ECP
H-ECP NONE
$END
Again, the 2nd oxygen copies from the first. It is handy
to use the rest of card -2- as a descriptive comment.
As a final example, for antimony we have LMAX+1=3 (there
are core d's). One must first enter U(f), followed by
U(s)-U(f), U(p)-U(f), U(d)-U(f).
==========================================================
1
$MCP
==========================================================
$MCP group (required if MCP READ was given on card -6U-)
This group lets you read in model core potentials, for
some or all of the atoms in the molecule. This is a fixed
format input group. For the review of the MCP method, see
M.Klobukowski, Y.Sakai, and S.Huzinaga, pp. 49-74 in J.
Leszczynski, "Computational Chemistry", vol. 3 (1999) .
*** Give input -1-, -2-, ..., -9- for each MCP atom ***
-card 1- ANAT
ANAT is a 8 character name for the MCP atom.
It must match the name given for that atom
in the $DATA group.
-card 2- NOAN, (NO(IS),NG(IS), IS=1,4) FORMAT(9I3)
IS = 1, 2, 3, 4 for s, p, d, and f symmetry, resp.
NOAN is the number of terms in the MCP
NO(IS) is the number of core orbitals in symmetry IS
NG(IS) is the number of basis functions used to
expand the core orbitals in symmetry IS
-card 3- ZEFF, MCPFMT FORMAT(F10.2, A8)
ZEFF is the number of valence electrons, e.g. 7.0
for Fluorine
MCPFMT is the format for reading floating-point
numbers in the MCP data
-card 4- (ACOEF(L), L=1,NOAN) FORMAT(MCPFMT)
ACOEF(L) is the L-th coefficient in the expansion of
the model core potential; more than one
line may be provided
ACOEF(L) is the defined as A(l) in Eq. (38)
of the MCP review paper.
-card 5- (AEXPN(L), L=1,NOAN) FORMAT(MCPFMT)
AEXPN(L) is the L-th exponent in the expansion of the
model core potential; more than one line
may be provided
AEXPN(L) is the defined as alpha(l) in Eq.
(38) of the MCP review paper.
-card 6- (NINT(L), L=1,NOAN) FORMAT(10I3)
NINT(L) is the power of R in the expansion of the
model core potential; NINT(L) is defined
as n(l) in Eq. (38) of the MCP review paper.
1
$MCP
*** For each symmetry IS present in the core orbitals ***
*** read the card set -7-, -8-, and -9- ***
-card 7- (BPAR(K), K=1,NO(IS)) FORMAT(MCPFMT)
BPAR(K) is the constant in the core projector
operator, B(k) in Eq. (41) of the review.
-card 8- (EX(I), I=1,NG(IS)) FORMAT(MCPFMT)
EX(I) is the exponent of the I-th Gaussian
function used to expand the core orbitals
*** Repeat -9- for each core orbital in symmetry IS ***
-card 9- (C(I), I=1,NG(IS)) FORMAT(MCPFMT)
C(I) expansion coefficients of the core orbital
The following example input file is for H2CO, and by
the way, provides another example of COORD=HINT.
!
$CONTRL RUNTYP=ENERGY COORD=HINT ECP=MCP $END
$DATA
Formaldehyde H2CO
CNV 2
C 6.0 LC 0.00 0.0 0.0 - O K
MCP READ <<<< this is an MCP atom
L 3 <<<< (311/311/1) basis
1 18.517235 -0.16370140 0.22673090E-01
2 2.5787547 -0.26304451 0.19109693
3 0.58994362 0.58040872 0.50918856
L 1
1 0.17330638 1.0000000 1.0000000
L 1
1 0.60957120E-01 1.0000000 1.0000000
D 1; 1 0.600 1.0
O 8.0 LC 1.2031 0.0 0.0 - O K
MCP READ <<<< this is an MCP atom
L 3 <<<< (311/311/1) basis
1 44.242510 -0.13535836 0.17372951E-01
2 6.2272700 -0.30476423 0.16466813
3 1.4361751 0.43955753 0.46721611
L 1
1 0.40211473 1.0000000 1.0000000
L 1
1 0.12688798 1.0000000 1.0000000
D 1; 1 1.154 1.0
H 1.0 PCC 1.1012 121.875 0.0 + O K I
TZV <<<< not an MCP atom, TZV+pol basis
P 1; 1 1.100 1.0
$END
1
$MCP
$MCP <<<< start of the MCP data
<<<< empty lines allowed
MCP for C NR (2S/2P) S(2)P(2) <<<< comment
<<<< empty lines allowed
C <<<< MCP for the atom C
2 1 14 <<<< NOAN, NO(1), NG(1)
4.00(4D15.8) <<<< ZEFF, MCPFMT
.41856306 .99599513E-01 <<<< ACOEF
16.910482 7.4125554 <<<< AEXPN
0 0 <<<< NINT
22.676882 <<<< B(1s)
26848.283 8199.1206 2798.3668 1048.2982
423.36984 181.26843 81.068295 37.403931
17.629539 8.4254263 4.0611964 1.9672294
.95541420 .46459041
.10743274D-03 .21285491D-03 .99343100D-03 .28327774D-02
.83154481D-02 .21694082D-01 .52916004D-01 .11618593D+00
.21812785D+00 .32180986D+00 .29375407D+00 .10974353D+00
.70844050D-02 .17825971D-02
MCP for O NR (2S/2P) S(2)P(4)
O <<<< MCP for the atom O
2 1 16
6.00(4D15.8)
.31002267 .27178756E-01
25.973731 13.843290
0 0
41.361784
57480.749 17270.167 5766.9282 2107.0076
829.06758 346.04791 151.12147 68.233250
31.542773 14.815300 7.0298236 3.3561489
1.6077662 .77153240 .37052330 .17799002
.85822477D-04 .18173691D-03 .84803428D-03 .25439914D-02
.76877460D-02 .20823429D-01 .52424753D-01 .11864010D+00
.22782741D+00 .33492260D+00 .28833079D+00 .93046197D-01
.55937988D-02 .16121923D-02 .10915544D-04 .21431633D-03
$END
==========================================================
1
$RELWFN
==========================================================
$RELWFN group (optional)
This group is relevant if RELWFN in $CONTRL chose the
NESC or RESC option for elimination of small components
from relativistic wavefunctions, to produce a corrected
single component wavefunction. In case of RESC, only the
one electron integral corrections are added, whereas for
NESC, corrections to two electron integrals are accounted
for by means of a relativistically averaged basis set.
Analytic gradients are programmed for both RESC and
NESC computations. For NESC, the one electron part of
the spin-orbit operator can be corrected, while for RESC,
one can compute spin-orbit coupling with relativistic
corrections to both one and two electron SOC integrals,
unless internal uncontraction is requested. In this case
only one electron SOC integrals are modified. It should
be noted that internally uncontracted basis functions with
very large exponents have large SOC integrals, thus the
average asymmetry due to RESC appears to be larger (before
contraction).
For NESC, you must provide three basis sets, for the
large and small components and an averaged one, which are
given in $DATAL, $DATAS, $DATA, respectively. The only
possible choice for these basis sets is due to Dyall, and
these are available from
http://www.emsl.pnl.gov:2080/forms/basisform.html
Their names are similar to cc-pVnZ(pt/sf/lc), pt=point or
fi=finite nucleus, sf for spin-free and the final field is
lc=large component ($DATAL), sc=small component ($DATAS),
and wf is a typo for Foldy-Wouthuysen 2e- basis ($DATA).
In GAMESS you can only use point nucleus approximation.
The need to input three basis sets means that you cannot
use a $BASIS group, and you must use COORD=UNIQUE style
input in the various $DATA's. The three $DATA groups must
contain identical information except for the primitive
expansion coefficients, as the three basis sets must have
the same exponents. In case the option to treat only some
atoms relativistically is chosen, all non-relativistic
atoms must have identical basis input in all three groups.
For RESC, ordinary basis sets are used. This however
is a misleading statement, for while any basis set will
run, accurate answers may be hard to obtain without the
use of basis sets contracted using the RESC approximation.
Experience is showing that large uncontracted basis sets
using non-relativistic exponents are probably OK, but that
standard contractions of these in NR calculations can lead
to spurious results. Unfortunately, contractions using
the RESC approximation are not yet available for ordinary
use.
1
$RELWFN
OPRESC gives additive (bitwise) options, which pertain to
the RESC method:
= 0 original RESC implementation, reproduces the
results prior to June 2001. The accuracy of
the RI may be inadequate. (default)
= 1 to obtain more accurate integrals, use the
Gaussian primitives rather than the contracted
basis set to define the resolution of the
identity (RI), used to simplify the integrals in
order to evaluate them in closed form. This
internally uncontracted basis set can be large,
but produces considerably increased accuracy in
the integrals (see also NRATOM/CHARGE).
= 2 HONDO's implementation of the RI for RESC is
mimicked, namely that for ISPHER=+1 the space
used for the RI will not have spherical
contaminants (similarly to MO space).
No gradients for HONDO style are available.
= 4 split L-shells into s and p when generating the
internally uncontracted basis set. This is
necessary if you are using s or p primitives
with the same exponents declared as some L
shell. In such a case, the L shell must be
entered before the s or p. 4 requires 1.
These options are additive, for example OPRESC=5
is needed to select 1 as well as 4.
NESOC = relativistic corrections to SOC integrals.
Choose only if RELWFN=RESC or NESC, and if
OPERAT=HSO1, HSO2P, or HSO2, for RUNTYP=TRANSITN
= 0 no corrections
= 1 one-electron spin-orbit integrals (NESC default)
= 2 one and two-electron integrals (RESC default)
For RESC and OPRESC=1, NESOC=2 is not implemented,
use NESOC=1 as the closest available possibility.
NRATOM the number of different elements to be treated
nonrelativistically. For example, in Pb3O4, to
treat only lead relativistically, enter NRATOM=1.
For NESC, this parameter affects the choice of the
basis sets, you should use identical large, small,
and averaged basis set for such atoms.
For RESC, this parameter means that OPRESC=1 will
not cause uncontracting primitives for such atoms.
(default=0)
CHARGE array containing charges of atoms to be treated
nonrelativistically. (e.g. CHARGE(1)=8.0, to drop
all oxygen atoms)
1
$RELWFN
* * * the next parameters are used only with RELWFN=RESC:
QMTTOL same as in $CONTRL, but used for the preparation of
the RI space for RESC. (default: from $CONTRL).
RESCTO tolerance for equating nearly degenerate eigenvalues
of the kinetic energy and overlaps, which is used
for evaluating RESC gradient. Values that are too
large (>1e-6) can cause numerical errors in the
gradient, approximately on the same order as RESCTO.
Too small values can add very large values to the
gradient due to division by numbers that are zero
within machine precision that are not avoided with
this tolerance filter. The recommended values for
OPRESC=1 are 1e-6 for gold to 1e-7 for silver. For
OPRESC=0, 1d-8 or smaller can be used.
==========================================================
1
$EFIELD
==========================================================
$EFIELD group (not required)
This group permits the study of the influence of an
external electric field on the molecule. The method is
general, and so works for all ab initio SCFTYPs.
EVEC = an array of the three x,y,z components of
the applied electric field, in a.u., where
1 Hartree/e*bohr = 5.1422082(15)d+11 V/m
SYM = a flag to specify when the field to be
applied breaks the molecular symmetry.
Since most fields break symmetry, the
default is .FALSE.
==========================================================
Restrictions: analytic hessians are not available, but
numerical hessians are. Because an external field causes
a molecule with a dipole to experience a torque, geometry
optimizations must be done in Cartesian coordinates only.
Internal coordinates eliminate the rotational degrees of
freedom, which are no longer free.
Notes: a hessian calculation will have two rotational
modes with non-zero "frequency", caused by the torque.
A gas phase molecule will rotate so that the dipole
moment is anti-parallel to the applied field. To carry
out this rotation during geometry optimization will take
many steps, and you can help save much time by inputting
a field opposite the molecular dipole. There is also
a stationary point at higher energy with the dipole
parallel to the field, which will have two imaginary
frequencies in the hessian. Careful, these will appear
as the first two modes in a hessian run, but will not
have the i for imaginary included on the printout since
they are rotational modes.
For an application, see
H.Kono, S.Koseki, M.Shiota, Y.Fujimura
J.Phys.Chem.A 105, 5627-5636(2001)
1
$INTGRL
==========================================================
$INTGRL group (optional)
This group controls AO integral formats. It should
probably never be given, as the program always picks
sensible values.
SCHWRZ = a flag to activate use of the Schwarz inequality
to predetermine small integrals. There is no
loss of accuracy when choosing this option, and
there are appreciable time savings for bigger
molecules. Default=.TRUE. for over 5 atoms, or
for direct SCF, and is .FALSE. otherwise.
QFMM = a flag to use the quantum fast multipole method
for linear scaling Fock matrix builds. This is
available for RHF, UHF, and ROHF wavefunctions,
and for DFT, but not with any other correlation
treatment. You must select DIRSCF=.TRUE. in
$SCF if you use this option.
The Optimal Parameter FMM code will run at a
comparable speed to a ordinary run doing all
integrals for molecules about 15 Angstroms in
size, and should run faster for 20 Angtroms or
more. See also the $FMM group. (default=.FALSE.)
NINTMX = Maximum no. of integrals in a record block.
(default=15000 for J or P file, =10000 for PK)
Various antiquated parameters follow:
NOPK = 0 PK integral option on, which is permissible
for RHF, UHF, ROHF, GVB energy/gradient runs.
= 1 PK option off (default for all jobs).
Must be off for anything with a transformation.
NORDER = 0 (default)
= 1 Sort integrals into canonical order. There
is little point in selecting this option, as
no part of GAMESS requires ordered integrals.
See also NSQUAR.
The following parameters control the integral sort.
NSQUAR = 0 Sorted integrals will be in triangular
canonical order (default)
= 1 instead sort to square canonical order.
NDAR = Number of direct access logical records to be
used for the integral sort (default=2000)
LDAR = Length of direct access records (site dependent)
NBOXMX = 200 Maximum number of bins.
NWORD = 0 Memory to be used (default=all of it).
NOMEM = 0 If non-zero, force external sort.
The following parameters control integral restarts.
IST= 1 JST= 1 KST= 1 LST= 1
NREC= 1 INTLOC= 1 (values given are defaults)
==========================================================
1
$FMM
==========================================================
$FMM group (relevant if QFMM selected in $INTGRL)
This group controls the quantum fast multipole method
evaluation of Fock matrices. The defaults are reasonable,
so there is little need to give this input.
ITGERR = Target error in final energy, to 10**-(ITGERR)
Hartree. The accuracy is usually better than
the setting of ITGERR, in fact QFMM runs should
suffer no loss of accuracy or be more accurate
than a conventional integral run (default=7).
QOPS = a flag to use the Quantum Optimum Parameter
Searching technique, which finds an optimum FMM
parameter set. (Default=.TRUE.)
If QOPS=.FALSE., the ITGERR value is not used. In this
case the user should specify the following parameters:
NP = the highest multipole order for FMM (Default=15).
NS = the highest subdivision level (Default=2).
IWS = the minimum well-separateness (Default=2).
IDPGD = point charge approximation error (10**(-IDPGD))
of the Gaussian products (Default=9).
IEPS = very fast multipole method (vFMM) error,
(10**(-IEPS)) (Default=9)
==========================================================
1
$TRANS
==========================================================
$TRANS group (optional for -CI- or -MCSCF-)
(relevant to analytic hessians)
(relevant to energy localization)
This group controls the integral tranformation. MP2
integral transformations are controlled instead by the
$MP2 input group. There is little reason to give any but
the first variable.
DIRTRF = a flag to recompute AO integrals rather than
storing them on disk. The default is .FALSE.
for MCSCF and CI runs. If your job reads $SCF,
and you select DIRSCF=.TRUE. in that group, a
direct transformation will be done, no matter
how DIRTRF is set.
Note that the transformation may do many passes over
the AO integrals for large basis sets, and thus the
direct recomputation of AO integrals can be very time
consuming.
MPTRAN = method to use for the integral transformation.
the default is try 0, then 1, then 2.
0 means use the incore method
1 means use the segmented method. This is the
only method that works in parallel.
2 means use the alternate method, which uses
less memory than 2, but requires an extra
large disk file.
NWORD = Number of words of fast memory to allow. Zero
uses all available memory. (default=0)
CUTTRF = Threshold cutoff for keeping transformed two
electron integrals. (default= 10**(-9))
AOINTS = defines AO integral storage during conventional
integral transformations, during parallel runs.
DUP stores duplicated AO lists on each node, and
is the default for parallel computers with slow
interprocessor communication, e.g. ethernet.
DIST distributes the AO integral file across
all nodes, and it is the default for parallel
computers with high speed communications.
==========================================================
1
The remaining groups apply only to MCSCF and CI runs.
* * * * * * * * * * * * * * * * * * *
For hints on how to do MCSCF and CI
see the 'further information' section
* * * * * * * * * * * * * * * * * * *
$CIINP
==========================================================
$CIINP group (optional, relevant for any CITYP)
This group is the control box for Graphical Unitary
Group Approach (GUGA) CI calculations or determinant based
CI. Each step which is executed potentially requires a
further input group described later.
NRNFG = An array of 10 switches controlling which steps of
a CI computation are performed.
1 means execute the module, 0 means don't.
NRNFG(1) = Generate the configurations. See either
$CIDRT or $CIDET input. (default=1)
NRNFG(2) = Transform the integrals. See $TRANS.
(default=1)
NRNFG(3) = Sort integrals and calculate the Hamiltonian
matrix. See $CISORT and $GUGEM. (default=1)
This does not apply to determinants.
NRNFG(4) = Diagonalize the Hamiltonian matrix.
See $GUGDIA or $CIDET. (default=1)
NRNFG(5) = Construct the one electron density matrix,
and generate NO's. See $GUGDM or $CIDET.
(default=1)
NRNFG(6) = Construct the two electron density matrix.
See $GUGDM2 or $CIDET.
(default=0 normally, but 1 for CI gradients)
NRNFG(7) = Construct the Lagrangian of the CI function.
Requires DM2 matrix exists. See $LAGRAN.
(default=0 normally, but 1 for CI gradients)
This does not apply to determinants.
NRNFG(8-10) are not used.
Users are not encouraged to change these values, as the
defaults are quite reasonable ones.
NPFLG = An array of 10 switches to produce debug printout.
There is a one to one correspondance to NRNFG, set
to 1 for output. (default = 0,0,0,0,0,0,0,0,0,0)
The most interesting is NPFLG(2)=1 to see the
transformed 1e- integrals, NPFLG(2)=2 adds the
very numerous transformed 2e- integrals to this.
IREST = n Restart the -CI- at stage NRNFG(n).
==========================================================
1
$DET/$CIDET/$GEN/$CIGEN
==========================================================
$DET group (required for MCSCF if CISTEP=ALDET or ORMAS)
$GEN group (required for SCFTYP=MCSCF if CISTEP=GENCI)
$CIDET group (required if CITYP=ALDET, ORMAS, or FSOCI)
$CIGEN group (required if CITYP=GENCI)
This group describes the determinants to be used in a
MCSCF or CI wavefunction:
a) For full CI calculations (ALDET) the $DET/$CIDET
will generate a full list of determinants. If the CI is
part of an MCSCF, this means the MCSCF is of the FORS type
(which is also known as CASSCF).
b) For Occupation Restricted Multiple Active Space
(ORMAS) CI, the input in $ORMAS will partition the active
orbitals defined here into separate spaces, that is,
provide both $DET/$CIDET and $ORMAS.
c) For Full Second Order CI, provide $CIDET and $SODET
inputs.
d) For a general CI (meaning user specified space orbital
products) provide $DET/$CIDET plus $GEN/$CIGEN and most
likely $GCILST (according to the keyword GLIST).
In the above, group names for MCSCF/CI jobs are separated
by a slash.
Determinants contain several spin states, in contrast
to configuration state functions. The Sz quantum number
of each determinant is the same, but the Hamiltonian
eigenvectors will have various spins S=Sz, Sz+1, Sz+2, ...
so NSTATE may need to account for states of higher spin
symmetry. In Abelian groups, you can specify the exact
spatial symmetry you desire.
GLIST = general determinant list option
The keyword GLIST must not be given in a $DET or
$CIDET input group! These both generate full
determinant lists, automatically.
= INPUT means an input $GCILST group will be read.
= EXTRNL means the list will be read from a disk
file GCILIST generated in an earlier run.
= SACAS requests generation of sevaral CAS spaces
of different space symmetries, specified by
the input IRREPS. This option is intended
for state averaged calculations for cases
of high symmetry, where degenerate irreps
of the true group may fall into different
irreps of the Abelian subgroup used.
1
$DET/$CIDET/$GEN/$CIGEN
* * * The next four define the orbital spaces * * *
There is no default for NCORE, NACT, and NELS:
NCORE = total number of orbitals doubly occupied in all
determinants.
NACT = total number of active orbitals.
NELS = total number of active electrons.
SZ = azimuthal spin quantum number for each of the
determinants, two times SZ is therefore the
number of excess alpha spins in each determinant.
The default is SZ=S, extracted from the MULT=2S+1
given in $CONTRL.
* * * The following determine the state symmetry * * *
GROUP = name of the point group. The default is to copy
this from $DATA, if that group is Abelian (C2,
Ci, Cs, C2v, C2h, D2, or D2h). If not, the
group is set to C1 (no symmetry used).
ISTSYM = specifies the spatial symmetry of the state.
This table is exactly the same as in $DRT input.
ISTSYM= 1 2 3 4 5 6 7 8
C1 A
Ci Ag Au
Cs A' A''
C2 A B
C2v A1 A2 B1 B2
C2h Ag Bu Bg Au
D2 A B1 B2 B3
D2h Ag B1g B2g B3g Au B1u B2u B3u
Default is ISTSYM=1, the totally symmetric state.
IRREPS = specifies the symmetries of the GLIST=SACAS space
determinant list. This variable should always be
an array, as a single symmetry is more quickly
obtained by the regular full CI code. The values
given have the same meaning as the ISTSYM table.
* * * the following control the diagonalization * * *
NSTATE = Number of CI states to be found, the default is
1. The maximum number of states is 100.
PRTTOL = Printout tolerance for CI coefficients, the
default is to print any larger than 0.05.
1
$DET/$CIDET/$GEN/$CIGEN
ANALYS = a flag to request analysis of the CI energy in
terms of single and double excitation pair
correlation energies. This is normally used in
CI computations, rather than MCSCF, and when the
wavefunction is dominated by a single reference,
as the analysis is done in terms of excitations
from the determinant with largest CI coefficient.
The defalt is .FALSE.
ITERMX = Maximum number of Davidson iterations per root.
The default is 100. A CI calculation will fail
if convergence is not obtained before reaching
the limit. MCSCF computations will not bomb
if the iteration limit is reached, instead the
last CI vector is used to proceed into the next
orbital update. In cases with very large active
spaces, it may be faster to input ITERMX=2 or 3
to allow the program to avoid fully converging
the CI eigenvalue problem during the early MCSCF
iterations. For small active spaces, it is
best to allow the CI step to be fully converged
on every iteration.
CVGTOL = Convergence criterion for Davidson eigenvector
routine. This value is proportional to the
accuracy of the coeficients of the eigenvectors
found. The energy accuracy is proportional to
its square. The default is 1.0E-5.
NHGSS = dimension of the Hamiltonian submatrix which
is diagonalized to obtain the initial guess
eigenvectors. The determinants forming the
submatrix are chosen on the basis of a low
diagonal energy, or if needed to complete a
spin eigenfunction. The default is 300.
NSTGSS = Number of eigenvectors from the initial guess
Hamiltonian to be included in the Davidson's
iterative scheme. It is seldom necessary to
include extra states to obtain convergence to
the desired states. The default equals NSTATE.
MXXPAN = Maximum number of expansion basis vectors in the
iterative subspace during the Davidson iterations
before the expansion basis is truncated. The
default is the larger of 10 or 2*NSTGSS. Larger
values might help convergence, do not decrease
this parameter below 2*NSTGSS.
CLOBBR = a flag to erase the disk file containing CI
vectors from the previous MCSCF iteration. The
default is to use these as starting values for
the current iteration's CI. If you experience
loss of spin symmetry in the CI step, reverse
the default, to always take the CI from the top.
Default = .FALSE.
1
$DET/$CIDET/$GEN/$CIGEN
* * * the following control the 1st order density * * *
These are ignored during MCSCF, but are used during a CI.
IROOT = the root whose density is saved on the disk file
for subsequent property analysis. Only one root
can be saved, and the default value of 1 means
the ground state. Be sure to set NFLGDM to form
the density of the state you are interested in!
NFLGDM = Controls each state's density formation.
0 -> do not form density for this state.
1 -> form density and natural orbitals for this
state, print and punch occ.nums. and NOs.
2 -> same as 1, plus print density over MOs.
The default is NFLGDM(1)=1,0,0,...,0 meaning
only ground state NOs are generated.
* * * the following control the state averaged
* * * 1st and 2nd order density matrix computation
Usually ignored by CI runs, these are relevant to MCSCF.
PURES = a flag controlling the spin purity of the state
avaraging. If true, the WSTATE array pertains
to the lowest states of the same S value as is
given by the MULT keyword in $CONTRL. In this
case the value of NSTATE will need to be bigger
than the total number of weights given by WSTATE
if there are other spin states present at low
energies. If false, it is possible to state
average over more than one S value, which might
be of interest in spin-orbit coupling jobs.
The default is .TRUE.
WSTATE = An array of up to 100 weights to be given to the
densities of each state in forming the average.
The default is to optimize a pure ground state,
WSTATE(1)=1.0,0.0,...,0.0
A small amount of the ground state can help the
convergence of excited states greatly.
Gradient runs are possible only with pure states.
Be sure to set NSTATE above appropriately!
==========================================================
1
$ORMAS
==========================================================
$ORMAS group (required for SCFTYP=MCSCF if CISTEP=ORMAS)
(required for CITYP=ORMAS)
This group partitions an active space, defined in $DET
or $CIDET, into Occupation Restricted Multiple Active
Spaces (ORMAS). All possible determinants satisfying the
occupation restrictions (and of course the space symmetry
restriction given in $DET/$CIDET) will be generated. This
group's usefulness lies in reducing the large number of
determinants present in full CI calculations with large
active spaces.
There are no sensible defaults for these inputs, but
if the group is entirely omitted, a full CI calculation
will be performed. That is, the defaults are
NSPACE=1, MSTART(1)=NCORE+1, MINE(1)=NELS, MAXE(1)=NELS
meaning all active orbitals are in one partition.
NSPACE = number of orbital groups you wish to partition
the active space (NACT in $DET/$CIDET) into.
MSTART = an array of NSPACE integers. These specify where
each orbital group starts in the full list. You
must not overlook the NCORE core orbitals in
computing MSTART values. Space I runs from
orbital MSTART(I) up to orbital MSTART(I+1)-1,
or NACT+NCORE if I is the last space, I=NSPACE.
IMPORTANT !!!! Remember to make sure your orbitals have
been reordered to suit MSTART, using NORDER in $GUESS.
MINE = an array of NSPACE integers. These specify the
minimum numbers of electrons that must always
occupy the orbital groups. In other words,
MINE(I) is the minimum number of electrons that
can occupy space I in any of the determinants.
MAXE = an array of NSPACE integers. These specify the
maximum numbers of electrons that must always
occupy the orbital groups. In other words,
MAXE(I) is the maximum number of electrons that
can occupy space I in any of the determinants.
The number of active electrons is NELS in $DET or $CIDET,
and the program will check that MINE/MAXE values are
consistent with this total number.
*** See REFS.DOC for more information on using ORMAS ***
==========================================================
1
$GCILST
==========================================================
$GCILST group (required for SCFTYP=MCSCF if CISTEP=GENCI)
(required if CITYP=GENCI)
This group defines space products to be used in the
general CI calculation, or in a MCSCF wavefunction. The
input is free format.
Line 1: NSPACE ISYM
The first line gives the total number of space products to
be entered in the second lines. The option ISYM can be
omitted, or given as 0, in which case the program will
verify that all space products typed in the second lines
indeed have the spatial symmetry defined by ISTSYM in the
$GEN or $CIGEN input groups. If ISYM is 1, the user is
indicating that more than one space symmetry is known to
be in the list, that this is intentional, and the program
should proceed with the calculation. This might be of use
in state averaging two representations in a group that has
more than two total representations, and therefore faster
than turning symmetry off completely by GROUP=C1. ISYM=2
has the same meaning but turns on additional printing.
Line 2 is repeated NSPACE times. Each line 2 contains NACT
integers, which must be 0, 1, or 2, and therefore tells the
occupation of each of the active orbitals in each space
product. An example input is:
$GEN GLIST=INPUT NELS=6 NACT=4 SZ=0.0 $END
$GCILST
5
2 2 2 0
2 1 2 1
2 0 2 2
2 2 0 2
0 2 2 2
$END
which generates 6 Ms=0 determinants, much less than the 16
determinants in a C1 symmetry full list for 6 e- in 4 MOs.
The second space product above generates two determinants.
All space products with singly occupied orbitals are used
to form all possible determinants, to ensure that the final
states are eigenfunctions of the S**2 operator (meaning
they will be pure spin states).
Note that there is no way at present to generate lists
such as singles and doubles from a single reference.
Convergence of MCSCF calculations will depend on how well
chosen your determinant list is, and may very well require
the use of the FULLNR or JACOBI convergers.
==========================================================
1
$SODET
==========================================================
$SODET group (required if CITYP=FSOCI)
This group controls a full second order CI calculation
using determinants (see also the keyword SOCI in $CIDRT).
Most of the characteristics of the active space (such as
NCORE, NACT, NELS) must be given in a $CIDET group, as
a preliminary full CI according to $CIDET will be made.
The FCI states will then used as the initial guess for
the full second order CI. A few additional parameters may
be given in this group, but many runs will not need to
give any of these.
NEXT = the number of external orbitals to be included.
The default is the entire virtual MO space.
NSOST = the number of states to be found in the SOCI.
The default is copied from NSTATE in $CIDET.
MAXPSO = maximum expansion space size used in the SOCI.
The default is copied from MXXPAN in $CIDET.
ORBS = MOS means use the MCSCF orbitals, which should be
allowed to undergo canonicalization (see the
CANONC keyword in $MCSCF), or the input $VEC
group in case SCFTYP=NONE. (default)
NOS means to instead use the natural orbitals of
the MCSCF.
==========================================================
1
$DRT/$CIDRT
==========================================================
$DRT group (required for SCFTYP=MCSCF if CISTEP=GUGA)
$CIDRT group (required if CITYP=GUGA)
This group describes the -MCSCF- or -CI- wavefunction.
The distinct row table is the means by which the Graphical
Unitary Group Approach (GUGA) names the configurations.
The group is spelled DRT for MCSCF runs, and CIDRT for
CI runs. The main difference in these is NMCC vs. NFZC.
There is no default for GROUP, and you must choose one
of FORS, FOCI, SOCI, or IEXCIT.
GROUP = the name of the point group to be used. This is
usually the same as that in $DATA, except for
RUNTYP=HESSIAN, when it must be C1. Choose from
the following: C1, C2, CI, CS, C2V, C2H, D2, D2H,
C4V, D4, D4H. If your $DATA group is not listed,
choose only C1 here.
FORS = flag specifying the Full Optimized Reaction Space
set of configuration should be generated. This
is usually set true for MCSCF runs, but if it is
not, see FORS in $MCSCF. (Default=.FALSE.)
FOCI = flag specifying first order CI. In addition to
the FORS configurations, all singly excited CSFs
from the FORS reference are included.
Default=.FALSE.
SOCI = flag specifying second order CI. In addition to
the FORS configurations, all singly and doubly
excited configurations from the FORS reference
are included. (Default=.FALSE.)
IEXCIT= electron excitation level, for example 2 will
lead to a singles and doubles CI. This variable
is computed by the program if FORS, FOCI, or
SOCI is chosen, otherwise it must be entered.
INTACT= flag to select the interacting space option. See
C.F.Bender, H.F.Schaefer J.Chem.Phys. 55,
4798-4803(1971). The CI will include only those
CSFs which have non-vanishing spin couplings with
the reference configuration. Note that when the
Schaefer group uses this option for high spin
ROHF references, they use Guest/Saunders orbital
canonicalization.
1
$DRT/$CIDRT
* * the next variables define the single reference * *
The single configuration reference is defined by
filling in the orbitals by each type, in the order shown.
The default for each type is 0.
Core orbitals, which are always doubly occupied:
NMCC = number of MCSCF core MOs (in $DRT only).
NFZC = number of CI frozen core MOs (in $CIDRT only).
Internal orbitals, which are partially occupied:
NDOC = number of doubly occupied MOs in the reference.
NAOS = number of alpha occupied MOs in the reference,
which are singlet coupled with a corresponding
number of NBOS orbitals.
NBOS = number of beta spin singly occupied MOs.
NALP = number of alpha spin singly occupied MOs in the
reference, which are coupled high spin.
NVAL = number of empty MOs in the reference.
External orbitals, occupied only in FOCI or SOCI:
NEXT = number of external MOs. If given as -1, this will
be set to all remaining orbitals (apart from any
frozen virtual orbitals).
NFZV = number of frozen virtual MOs, never occupied.
* * the next two help with state symmetry * *
ISTSYM= irreducible representation for GUGA wavefunction.
This option overwrites whatever symmetry is implied
by NALP/NAOS/NBOS. Default=0 means ISTSYM will be
inferred from the symmetry of the reference, namely
from the symmetry of NALP/NAOS/NBOS orbitals.
ISTSYM= 1 2 3 4 5 6 7 8
C1 A
Ci Ag Au
Cs A' A''
C2 A B
C2v A1 A2 B1 B2
C2h Ag Bu Bg Au
D2 A B1 B2 B3
D2h Ag B1g B2g B3g Au B1u B2u B3u
It is no doubt easier to just select the desired
ISTSYM directly. Its computation from the singly
occupied orbitals is kept merely to preserve old
input files.
1
NOIRR= controls labelling of the CI state symmetries.
= 1 no labelling (default)
= 0 usual labelling. This can be very time consuming
if the group is non-Abelian.
=-1 fast labelling, in which all CSFs with small CI
coefficients are ignored. This can produce weights
quite different from one, due to ignoring the small
coefficients, but overall seems to work OK.
Note that it is normal for the weights not to sum
to 1 even for NOIRR=0 because for simplicity the
weight determination is focused on the relative
weights rather than absolute. However weight do
not sum to one only for row-mixed MOs.
= -2,-3... fast labelling and sets SYMTOL=10**NOIRR
for runs other than TRANSITN. All irreps with
weights greater than SYMTOL are considered.
* * * the final choices are seldom used * * *
MXNINT = Buffer size for sorted integrals. (default=20000)
Adjust this upwards if the program tells you to,
which may occur in cases with large numbers of
external orbitals.
MXNEME = Buffer size for energy matrix. (default=10000)
NPRT = Configuration printout control switch.
This can consume a HUMUNGUS amount of paper!
0 = no print (default)
1 = print electron occupancies, one per line.
2 = print determinants in each CSF.
3 = print determinants in each CSF (for Ms=S-1).
==========================================================
1
$MCSCF
==========================================================
$MCSCF group (optional for -MCSCF-)
This group controls the MCSCF orbital optimization
step. The difference between the five convergence methods
is outlined in Chapter Four of this manual, which you must
carefully study before attempting MCSCF computations.
--- the next chooses the configuration basis ---
CISTEP = ALDET chooses the Ames Lab. determinant full CI,
and requires $DET input. (default)
= ORMAS chooses an Occupation Restricted Multiple
Active Space determinant CI, requiring
both $DET and $ORMAS inputs.
= GUGA chooses the graphical unitary group CSFs,
and requires $DRT input. This is the
only value usable with the QUAD converger.
= GENCI chooses the Ames Lab. general CI, and
requires $GEN input.
--- the next five choose the orbital optimizer ---
FOCAS = a flag to select a method with a first order
convergence rate. (default=.FALSE.)
Parallel runs with FOCAS do not use MEMDDI.
SOSCF = a flag selecting an approximately second order
convergence method, using an approximate orbital
hessian. (default=.TRUE.)
Parallel runs with SOSCF do not use MEMDDI.
FULLNR = a flag selecting a second order method, with an
exact orbital hessian. (default=.FALSE.)
Parallel runs with FULLNR require input of MEMDDI.
QUAD = a flag to pick a fully quadratic (orbital and
CI coefficient) optimization method, which is
applicable to FORS or non-FORS wavefunctions.
QUAD may not be used with state-averaging.
(default = .FALSE.)
This converger can be used only in serial runs.
JACOBI = a flag to pick a program that minimizes the
MCSCF energy by a sequence of 2x2 Jacobi
orbital rotations. This is very systematic in
forcing convergence, although the number of
iterations may be high and the time longer
than the other procedures. This option does
not compute the orbital Lagrangian, hence at
present nuclear gradients may not be computed.
(default = .FALSE.)
This converger can be used only in serial runs.
Note that FOCAS must be used only with FORS=.TRUE. in $DRT.
The other convergers are usable for either FORS or non-FORS
wavefunctions, although convergence is always harder in the
latter case, when FORS below must be set .FALSE.
1
$MCSCF
--- the next apply to all convergence methods ---
FORS = a flag to specify that the MCSCF function is of
the Full Optimized Reaction Space type, which is
sometimes known as CAS-SCF. .TRUE. means omit
active-active rotations from the optimization.
Since convergence is usually better with these
rotations included, the default is sensible:
.TRUE. for FOCAS, .FALSE. for FULLNR or QUAD,
and for SOSCF, .TRUE. for ALDET/GUGA but .FALSE.
for ORMAS/GENCI)
ACURCY = the major convergence criterion, the maximum
permissible asymmetry in the Lagrangian matrix.
(default=1.0E-05)
ENGTOL = a secondary convergence criterion, the run is
considered converged when the energy change is
smaller than this value. (default=1.0E-10)
MAXIT = Maximum number of iterations (default=100 for
FOCAS, 60 for SOSCF, 30 for FULLNR or QUAD)
MICIT = Maximum number of microiterations within a
single MCSCF iteration. (default=5 for FOCAS
or SOSCF, or 1 for FULLNR or QUAD)
NWORD = The maximum memory to be used, the default is
to use all available memory. (default=0)
CANONC = a flag to cause formation of the closed shell
Fock operator, and generation of canonical core
orbitals. This will order the MCC core by their
orbital energies. (default=.TRUE.)
EKT = a flag to cause generation of extended Koopmans'
theorem orbitals and energies. (Default=.FALSE.)
For this option, see R.C.Morrison and G.Liu,
J.Comput.Chem., 13, 1004-1010 (1992). Note that
the process generates non-orthogonal orbitals, as
well as physically unrealistic energies for the
weakly occupied MCSCF orbitals. The method is
meant to produce a good value for the first I.P.
NPUNCH = MCSCF punch option (analogous to $SCF NPUNCH)
0 do not punch out the final orbitals
1 punch out the occupied orbitals
2 punch out occupied and virtual orbitals
The default is NPUNCH = 2.
NPFLG = an array of debug print control. This is
analagous to the same variable in $CIINP.
Elements 1,2,3,4,6,8 make sense, the latter
controls debugging the orbital optimization.
1
$MCSCF
--- the next refers to SOSCF optimizations ---
NOFO = set to 1 to skip use of FOCAS for one iteration
during SOSCF. This is a testing parameter, at
present NOFO defaults to 0 to do one FOCAS iter.
--- the next three refer to FOCAS optimizations ---
CASDII = threshold to start DIIS (default=0.05)
CASHFT = level shift value (default=1.0)
NRMCAS = renormalization flag, 1 means do Fock matrix
renormalization, 0 skips (default=1)
--- the next applies to the QUAD method ---
(note that all FULLNR input is also relevant to QUAD)
QUDTHR = threshold on the orbital rotation parameter,
SQCDF, to switch from the initial FULLNR
iterations to the fully quadratic method.
(default = 0.05)
--- The JACOBI converger accepts FULLNR options ---
--- NORB, NOROT, MOFRZ, and FCORE as input ---
--- all remaining input applies only to FULLNR ---
DAMP = damping factor, this is adjusted by the program
as necessary. (default=0.0)
METHOD = DM2 selects a density driven construction of the
Newton-Raphson matrices. (default).
= TEI selects 2e- integral driven NR construction.
See the 'further information' section for more
details concerning these methods. TEI is slow!
LINSER = a flag to activate a method similar to direct
minimization of SCF. The method is used if
the energy rises between iterations. It may in
some circumstances increase the chance of
converging excited states. (default=.FALSE.)
FCORE = a flag to freeze optimization of the MCC core
orbitals, which is useful in preparation for
RUNTYP=TRANSITN jobs. Setting this flag will
automatically force CANONC false. This option
is incompatible with gradients, so can only be
used with RUNTYP=ENERGY. It is a good idea to
decrease TOLZ and TOLE in $GUESS by two orders
of magnitude to ensure the core orbitals are
unchanged during input. (default=.FALSE.)
1
$MCSCF
--- the last four FULLNR options are seldom used ---
DROPC = a flag to include MCC core orbitals during the
CI computation. The default is to drop them
during the CI, instead forming Fock operators
which are used to build the correct terms in
the orbital hessian. (default = .TRUE.)
NORB = the number of orbitals to be included in the
optimization, the default is to optimize with
respect to the entire basis. This option is
incompatible with gradients, so can only be used
with RUNTYP=ENERGY. (default=number of AOs
given in $DATA).
MOFRZ = an array of orbitals to be frozen out of the
orbital optimization step (default=none frozen).
NOROT = an array of up to 250 pairs of orbital rotations
to be omitted from the NR optimization process.
The program automatically deletes all core-core
rotations, all act-act rotations if FORS=.T.,
and all core-act and core-virt rotations if
FCORE=.T. Additional rotations are input as
I1,J1,I2,J2... to exclude rotations between
orbital I running from 1 to NORB, and J running
up to the smaller of I or NVAL in $TRANS.
==========================================================
1
$MCQDPT
==========================================================
$MCQDPT group (relevant to SCFTYP=MCSCF if MPLEVL=2)
Controls 2nd order MCQDPT (multiconfiguration quasi-
degenerate perturbation theory) runs, if requested by
MPLEVL=2 in $CONTRL. MCQDPT2 is implemented only for
FORS (aka CASSCF) wavefunctions. The MCQDPT method is a
multistate, as well as multireference perturbation theory.
The implementation is a separate program, interfaced to
GAMESS, with its own procedures for determination of the
canonical MOs, CSF generation, integral transformation,
CI in the reference CAS, etc. Therefore some of the input
in this group repeats data given elsewhere, particularly
for $DET/$DRT.
Analytic gradients are not available. Spin-orbit
coupling may be treated as a perturbation, included at
the same time as the energy perturbation. If spin-
orbit calculations are performed, the input groups for
each multiplicity are named $MCQD1, $MCQD2, ... rather
than $MCQDPT. Parallel calculation is implemented.
When applied to only one state, the theory is known as
multi-reference Moller-Plesset (MRMP), so the term MCQDPT
is more appropriate when this theory is used in its multi-
state form. Please note that this perturbation theory is
not the same thing as the CASPT2 theory, and should -NEVER-
be called that. A more complete discussion may be found in
the 'Further Information' chapter.
*** MCSCF reference wavefunction ***
NEL = total number of electrons, including core.
(default from $DATA and ICHARG in $CONTRL)
MULT = spin multiplicity (default from $CONTRL)
NMOACT = Number of orbitals in FORS active space
(default is the active space in $DET or $DRT)
NMOFZC = number of frozen core orbitals, NOT correlated
in the perturbation calculation. (default is
number of chemical cores)
NMODOC = number of orbitals which are doubly occupied in
every MCSCF configuration, that is, not active
orbitals, which are to be included in the
perturbation calculation. (The default is all
valence orbitals between the chemical core and
the active space)
NMOFZV = number of frozen virtuals, NOT occupied during
the perturbation calculation. The default is
to use all virtuals in the MP2. (default=0)
If the input file does not provide a $DET or $DRT, the
user must give NMOFZC, NMODOC, and NMOACT correctly here.
1
$MCQDPT
ISTSYM = the state symmetry of the target state(s).
This is given as an integer, note that only
Abelian groups in $DATA are supported:
ISTSYM= 1 2 3 4 5 6 7 8
C1 A
Ci Ag Au
Cs A' A''
C2 A B
C2v A1 A2 B1 B2
C2h Ag Bu Bg Au
D2 A B1 B2 B3
D2h Ag B1g B2g B3g Au B1u B2u B3u
(The default is inherited from $DET or $DRT)
NOSYM = 0 use CSF symmetry (see the ISTSYM keyword).
off diagonal perturbations vanish if states are
of different symmetry, so the most efficient
computation is a separate run for every space
symmetry. (default)
1 turn off CSF state symmetry so that all states
are treated at once. ISTSYM is ignored.
Presently this option does not seem to work!!
-1 Symmetry purify the orbitals. Since $GUESS is
not read by MCQDPT runs, this option can be used
as a substitute for its PURIFY. After cleaning
the orbitals, they are reorthogonalised within
each irrep and within each group (core, double,
active, virtual) separately. Since this occurs
after MCSCF optimization (see INORB), it is
*your* responsibility to verify that the changes
made to the orbitals are small enough that the
CAS energies for the original CASSCF and the
CAS-CI performed during MCQDPT give the same
energies!
*** perturbation specification ***
KSTATE= state is used (1) or not (0) in the MCQDPT2.
Maximum of 20 elements, including zeros.
For example, if you want the perturbation
correction to the second and the fourth roots,
KSTATE(1)=0,1,0,1
See also WSTATE. (default=1,0,0,0,0,0,0,...)
*** MO input and flow control ***
INORB = 0 optimize the MCSCF wavefunction in this run.
= 1 read the converged orbitals from a $VEC group,
and skip immediately to the MCQDPT computation.
A complete $VEC including virtuals must be given.
(default=0)
1
$MCQDPT
*** Intruder State Removal ***
EDSHFT = energy denominator shifts. (default=0.0,0.0)
Intruder State Avoidance (ISA) calculations
can be made by changing the energy denominators
around poles (where the denominator is zero).
Each denominator x is replaced by x + EDSHFT/x,
so that far from the poles (when x is large) the
effect of such change is small. EDSHFT is an
array of two values, the first is used in spin-
free MCQDPT, and the second is for spin-orbit
MCQDPT. Both values are used if RUNTYP=TRNSTN,
only the first is used otherwise. A suggested
pair of values is 0.02,0.1, but experimentation
with your system is recommended. Setting these
values to zero is ordinary MCQDPT, and infinite
collapses to the MCSCF reference. Note that the
energy denominators (which are ket-dependent in
MCQDPT) are changed in a different way for each
ket-vector, that is, for each row in MCQDPT
Hamiltonian matrix. In other words, the zeroth
order energies are not "universal", but state
specific. This is strictly speaking some weak
inconsistency in defining zeroth order energies
that are usually chosen "universally".
In order to maintain continuity when studying
a PES, one usually uses the same EDSHFT values
for all points on PES. In order to study the
potential surface for any extended range of
geometries, it is recommended to use ISA, as it
is quite likely that one or more regions of the
PES will be unphysical due to intruder states.
For an example of how intruder states can appear
at some points on the PES, see Figures 1,2,7 of
K.R.Glaesemann, M.S.Gordon, H.Nakano
Phys.Chem.Chem.Phys. 1, 967-975(1999)
and also
H.A.Witek, D.G.Fedorov, K.Hirao, A.Viel,
P.-O.Widmark J.Chem.Phys. 116, 8396-406(2002)
For a discussion of intruder state removal from
MCQDPT, see
H.A.Witek, Y.-K.Choe, J.P.Finley, K.Hirao
J.Comput.Chem. 23, 957-965(2002)
See also REFWGT.
1
$MCQDPT
REFWGT = a flag to request decomposition of the second
order energy into internal, semi-internal, and
external contributions, and to obtain the weight
of the MCSCF reference in the 1st order wave
function. This option significantly increases
the run time! When you run in parallel, only
the transformation steps will speed up, as the
PT part of the reference weight calculation has
not been adapted for speedups (default = .FALSE.)
The EDSHFT option does not apply if REFWGT is
used. One purpose of using REFWGT is to try to
understand the nature of the intruder states.
*** Canonical Fock orbitals ***
IFORB = 0 omit this step.
= 1 determine the canonical Fock orbitals. (default)
= 3 canonicalise the Fock orbitals averaged over
all $MCQDx input groups. This option pertains
only to RUNTYP=TRANSITN. It is primarily meant
to include spin-orbit coupling perturbation into
the energy perturbation, but could also be used
in conjunction with OPERAT=DM to calculate only
the second order energy perturbation. IFORB=3
means that WSTATE is used as follows: In each
$MCQDx group, the WSTATE weights are divided by
the total number of states (sum(i) IROOTS(i)),
so the sum over all WSTATE values in all $MCQDx
groups is normalized to sum to 1. Thus there is
no normalisation to 1 within each $MCQDx group.
This option might be used to speed up an atomic
MCQDPT, e.g. if computing the 3-P ground state
of carbon, one would want to average over all
three spatial components of the P term, to be
sure of spatial degeneracy, but then run the
perturbation using symmetry, separately on the
B1g+B2g+B3g subspecies (within D2h) of a P term.
It is very important to give weights, appropriate
for the symmetry, the input requires care.
WSTATE = weight of each CAS-CI state in computing the
closed shell Fock matrix. You must enter 0.0
whenever the same element in KSTATE is 0.
In most cases setting all WSTATE for states
to be included in the MCQDPT to an equal value
is the best.
(default is WSTATE(1)=1.0,0.0,0.0,...)
1
$MCQDPT
*** Miscellaneous options ***
ISELCT is an option to select only the important CSFs
for inclusion into the CAS-CI reference states.
Set to 1 to select, or to 0 to avoid selection of
CSFs (default = 0)
All CSFs in a preliminary complete active space
CI whose CI coefficients exceed the square root
of THRWGT are kept in a smaller CI to determine
the zero-th order states. Note that the CSFs
with smaller coefficients, while excluded from
the reference states, are still used during the
perturbation calculation, so most of their energy
contribution is still retained. This can save
appreciable computer time in cases with large
active spaces.
THRWGT = weight threshold for retaining CSFs in selected
configuration runs. In quantum mechanics, the
weight of a CSF is the square of its CI
coefficient. (default=1d-6)
THRGEN = threshold for one-, two-, and three-body
density matrix elements in the perturbation
calculation. The default gives about 6 decimal
place accuracy in the energies. Increase to
1D-9 or 1D-10 if you wish to obtain higher
accuracy (default=1D-8)
THRENE = threshold for the energy convergence in the
Davidson's method CAS-CI. (default=-1.0D+00)
THRCON = threshold for the vector convergence in the
Davidson's method CAS-CI. (default=1.0D-06)
MDI = dimension of small Hamiltonian diagonalized to
prepare initial guess CI states. (default=50)
MXBASE = maximum number of expansion vectors in the
Davidson diagonalization subspace (e.g. MXXPAN).
(default=50)
NSOLUT = number of states to be solved for in the
Davidson's method, this might need to exceed
the number of states in the perturbation
treatment in order to "capture" the correct
roots.
NSTOP = maximum number of iterations to permit in
the Davidson's diagonalization.
1
$MCQDPT
LPOUT = print option, 0 gives normal printout, while
<0 gives debug print (e.g. -1, -5, -10, -100)
In particular, LPOUT=-1 gives more detailed
timing information. (default=0)
The next three parameters refer to parallel execution:
DOORD0 = a flag to select reordering of AO integrals
which speeds the integral transformations.
This reduces disk writes, but increases disk
reads, so you can try turning it off if your
machine has slow writes. (default=.TRUE.)
PARAIO = access 2e- integral file on every node, at
the same time. This affects only runs with
DOORD0 true, and it may be useful to turn
this off in the case of SMP nodes sharing
a common disk drive. (default=.TRUE.)
DELSCR = a flag to delete file 56 containing half-
transformed integrals after it has been
used. This reduces total disk requirements
if this file is big. (default=.FALSE.)
Note that parallel execution will be more effective
if you use distributed memory, MEMDDI in $SYSTEM. Use
of AOINTS=DIST in $TRANS is likely to be helpful in
situations with relatively poor I/O rates compared to
communication, e.g. SMP enclosures forced to share a
single scratch disk system. See PROG.DOC for more
information on parallel execution.
Finally, there are additional very specialized input
options, described in the source code routine MQREAD:
IROT, LENGTH, MAXCSF, MAXERI, MAXROW, MXTRFR, THRERI,
MAINCS, NSTATE
==========================================================
1
$CISORT $GUGEM
==========================================================
$CISORT group (optional, relevant for -CI- and -MCSCF-)
This group provides further control over the sorting
of the transformed integrals.
NDAR = Number of direct access records.
(default = 2000)
LDAR = Length of direct access record (site dependent)
NBOXMX = Maximum number of boxes in the sort.
(default = 200)
NWORD = Number of words of fast memory to use in this
step. A value of 0 results in automatic use of
all available memory. (default = 0)
NOMEM = 0 (set to one to force out of memory algorithm)
==========================================================
$GUGEM group (optional, relevant for -CI- or -MCSCF-)
This group provides further control over the
calculation of the energy (Hamiltonian) matrix.
CUTOFF = Cutoff criterion for the energy matrix.
(default=1.0E-8)
NWORD = not used.
==========================================================
1
$GUGDIA
==========================================================
$GUGDIA group (optional, relevant for -CI- or -MCSCF-)
This group provides control over the Davidson method
diagonalization step.
NSTATE = Number of CI states to be found. (default=1)
You can solve for any number of states, but only
100 can be saved for subsequent sections, such
as state averaging.
PRTTOL = Printout tolerance for CI coefficients
(default = 0.05)
MXXPAN = Maximum no. of expansion basis vectors used
before the expansion basis is truncated.
(default=30)
ITERMX = Maximum number of iterations (default=50)
CVGTOL = Convergence criterion for Davidson eigenvector
routine. This value is proportional to the
accuracy of the coeficients of the eigenvector(s)
found. The energy accuracy is proportional to
its square. (default = 1.0E-5)
NWORD = Number of words of fast memory to use in this
step. A value of zero results in the use of all
available memory. (default = 0)
MAXHAM = specifies dimension of Hamiltonian to try to
store in memory. The default is to use all
remaining memory to store this matrix in memory,
if it fits, to reduce disk I/O to a minimum.
MAXDIA = maximum dimension of Hamiltonian to send to an
incore diagonalization. If the number of CSFs
is bigger than MAXDIA, an iterative Davidson
procedure is invoked. Default=100
NIMPRV = Maximum no. of eigenvectors to be improved every
iteration. (default = nstate)
NSELCT = Determines initial guess to eigenvectors.
= 0 -> Unit vectors corresponding to the NSTATE
lowest diagonal elements and any diagonal
elements within SELTHR of them. (default)
< 0 -> First abs(NSELCT) unit vectors.
> 0 -> use NSELCT unit vectors corresponding to
the NSELCT lowest diagonal elements.
SELTHR = Guess selection threshold when NSELCT=0.
(default=0.01)
1
$GUGDIA
NEXTRA = Number of extra expansion basis vectors to be
included on the first iteration. NEXTRA is
decremented by one each iteration. This may be
useful in "capturing" vectors for higher states.
(default=5)
On AXP processors, enter as 0 to avoid core dumps.
KPRINT = Print flag bit vector used when
NPFLG(4)=1 in the $CIINP group (default=8)
value 1 bit 0 print final eigenvalues
value 2 bit 1 print final tolerances
value 4 bit 2 print eigenvalues and tolerances
at each truncation
value 8 bit 3 print eigenvalues every iteration
value 16 bit 4 print tolerances every iteration
Inputs for a multireference Davidson correction, in case
the orbitals are from a MCSCF.
NREF = number of CSFs in the MCSCF (full CI) job.
EREF = the energy of the MCSCF reference.
==========================================================
1
$GUGDM
==========================================================
$GUGDM group (optional, relevant for -CI-)
This group provides further control over formation of
the one electron density matrix. See NSTATE in $GUGDIA.
NFLGDM = Controls each state's density formation.
0 -> do not form density for this state.
1 -> form density and natural orbitals for this
state, print and punch occ.nums. and NOs.
2 -> same as 1, plus print density over MOs.
(default=1,99*0, means ground state NOs only)
Note that forming the 1-particle density for a
state is negligible against the diagonalization
time for that state.
IROOT = The -CI- root whose density matrix is saved on
the direct access dictionary file for later
computation of properties. You may save only
one state's density for property evaluation.
(default=1)
WSTATE = An array of up to 100 weights to be given to the
1 body density of each state in forming the DM1.
It is not physically reasonable to average over
any CI states that are not degenerate, but it
may be useful to use WSTATE to produce a totally
symmetric density when the states are degenerate.
The averaged density will be used for property
computations, as well as to generate natural
orbitals. The default is to use NFLGDM/IROOT,
unless WSTATE information is given, in which case
NFLGDM/IROOT are ignored.
IBLOCK = Density blocking switch. If nonzero, the off
diagonal block of the density above row IBLOCK
will be set to zero before the (approximate)
natural orbitals are found. One use for this is
to keep the internal and external orbitals in a
FOCI or SOCI calculation from mixing, in which
case IBLOCK is the highest occupied internal
orbital. (default=0)
NWORD = Number of words of memory to use. Zero means use
all available memory (default=0).
==========================================================
1
$GUGDM2
==========================================================
$GUGDM2 group (optional, relevant for -CI- or -MCSCF-)
This group provides control over formation of the
2-particle density matrix.
WSTATE = An array of up to 100 weights to be given to the
2 body density of each state in forming the DM2.
The default is to optimize a pure ground state.
(Default=1.0,99*0.0)
A small amount of the ground state can help the
convergence of excited states greatly.
Gradient runs are possible only with pure states.
Be sure to set NSTATE in $GUGDIA appropriately!
CUTOFF = Cutoff criterion for the 2nd-order density.
(default = 1.0E-9)
NWORD = Number of words of fast memory to use in sorting
the DM2. The default uses all available memory.
(default=0).
NOMEM = 0 uses in memory sort, if possible.
= 1 forces out of memory sort.
NDAR = Number of direct access records. (default=4000)
LDAR = Length of direct access record (site dependent)
NBOXMX = Maximum no. of boxes in the sort. (default=200)
==========================================================
1
$LAGRAN $TRFDM2
==========================================================
$LAGRAN group (optional, relevant for -CI- gradient)
This group provides further control over formation of
the CI Lagrangian, a quantity which is necessary for the
computation of CI gradients.
NOMEM = 0 form in core, if possible
= 1 forces out of core formation
NWORD = 0 (0=use all available memory)
NDAR = 4000
LDAR = Length of each direct access record
(default is NINTMX from $INTGRL)
==========================================================
$TRFDM2 group (optional, relevant for -CI- gradient)
This group provides further control over the back
transformation of the 2 body density to the AO basis.
NOMEM = 0 transform and sort in core, if possible
= 1 transform in core, sort out of core, if poss.
= 2 transform out of core, sort out of core
NWORD = 0 (0=use all available memory)
CUTOFF= 1.0D-9, threshold for saving DM2 values
NDAR = 2000
LDAR = Length of each direct access record
(default is system dependent)
NBOXMX= 200
==========================================================
Usually neither of these two groups is given. Since these
groups are normally used only for CI gradient runs, we
list here some of the restrictions on the CI gradients:
a) SCFTYP=RHF, only
b) no FZV orbitals in $CIDRT, all MOs must be used.
c) the derivative integrals are computed in the 2nd
derivative code, which is limited to spd basis sets.
d) the code does not run in parallel.
e) Use WSTATE in $GUGDM2 to specify the state whose
gradient is to be found. Use IROOT in $GUGDM to
specify the state whose other properties will be
found. These must be the same state!
f) excited states often have different symmetry than the
ground state, so think about GROUP in $CIDRT.
g) the gradient can probably be found for any CI for
which you have sufficient disk to do the CI itself.
Time is probably about 2/3 additional.
1
$TRANST
==========================================================
$TRANST group (relevant for RUNTYP=TRANSITN)
(only for CITYP=GUGA or MPLEVL=2)
This group controls the evaluation of the radiative
transition moment, or spin orbit coupling (SOC). An SOC
calculation can be based on variational CI wavefunctions,
using GUGA CSFs, or based on 2nd order perturbation theory
using the MCQDPT multireference perturbation theory.
These are termed SO-CI and SO-MCQDPT below. The orbitals
are typically obtained by MCSCF computations, and since
the CI or MCQDPT wavefunctions are based on those MCSCF
states, the zero-th order states are referred to below as
the CAS-CI states. SOC jobs prepare a model Hamiltonian
in the CAS-CI basis, and diagonalize it to produce spin-
mixed states, which are linear combinations of the CAS-CI
states. If scalar relativistic corrections were included
in the underlying spin-free wavefunctions, it is possible
either to include or to neglect similar corrections to the
spin-orbit integrals, see keyword NESOC in $RELWFN.
An input file to perform SO-CI will contain
SCFTYP=NONE CITYP=GUGA MPLEVL=0 RUNTYP=TRANSITN
while a SO-MCQDPT calculation will have
SCFTYP=NONE CITYP=NONE MPLEVL=2 RUNTYP=TRANSITN
The SOC job will compute a Hamiltonian matrix as the sum
of spin-free terms and spin-orbit terms, H = H-sf + H-so.
For SO-CI, the matrix H-sf is diagonal in the CAS-CI state
basis, with the LS-coupled CAS-CI energies as the diagonal
elements, and H-so contains only off-diagonal couplings
between these LS states,
H-sf = CAS-CI spin-free E
H-so = CAS SOC Hamiltonian (e.g. HSO1, HSO2P, HSO2)
For SO-MCQDPT, the additional input PARMP defines these
matrices differently. For PARMP=0, the spin-free term
has diagonal and off-diagonal MCQDPT perturbations:
H-sf - CAS-CI spin-free E + 2nd order spin-free MCQDPT
H-so - CAS SOC Hamiltonian
For PARMP not equal to 0, the spin orbit operator is also
included into the perturbing Hamiltonian of the MCQDPT:
H-sf - CAS-CI spin-free E + 2nd order spin-free MCQDPT
H-so - CAS SOC Hamiltonian + 2nd order SO-MCQDPT
Pure transition moment calculations (OPERAT=DM) are
presently limited to CI wavefunctions, so please use only
CITYP=GUGA MPLEVL=0. The transition moments computed by
SO-MCQDPT runs (see TMOMNT flag) will form the transition
density for the CAS-CI zeroth order states rather than the
1st order perturbed wavefunctions.
Please see REFS.DOC for additional information on what
is actually a fairly complex input file to prepare.
1
$TRANST
OPERAT selects the type of transition being computed.
= DM calculates radiative transition moment
between states of same spin, using
the dipole moment operator. (default)
= HSO1 one-electron Spin-Orbit Coupling (SOC)
= HSO2P partial two electron and full 1e- SOC,
namely core-active 2e- contributions are
computed, but active-active 2e- terms
are ignored. This generally captures
>90% of the full HSO2 computation, but
with spin-orbit matrix element time
similar to the HSO1 calculation.
= HSO2 one and two-electron SOC, this is the
full Pauli-Breit operator.
= HSO2FF one and two-electron SOC, the form factor
method gives the same result as HSO2, but
is more efficient in the case of small
active spaces, small numbers of CAS-CI
states, and large atomic basis sets.
This final option applies only to SO-CI.
PARMP = controls inclusion of the SOC terms in SO-MCQDPT,
for OPERAT=HSO1 (default=1) or for HSO2P/HSO2
(default=3) only.
0 - no SOC terms should be included in the MCQDPT
corrections at 2nd order, but they will be
included in the CAS states on which the MCQDPT
(i.e. up to 1st order)
1 - include the 1e- SOC perturbation in MCQDPT
-1 - defined under "3", read on...
3 - full 1-electron and partial 2-electron in the
form of the mean field perturbation (this is
very similar to HSO2P, but in the MCQDPT2
perturbation). Only doubly occupied orbitals
(NMODOC) are used for the core 2e contribution.
if the option is set to -1, then all core
orbitals (NMOFZC+NMODOC) are used. Neither
calculation includes extra diagrams including
filled orbitals, so both are "partial".
PARMP=3 (or -1) has almost no extra cost compared to
PARMP=1, but can only be used with OPERAT=HSO2 or HSO2P.
The options -1 and 3 are not rigorously justified, contrary
to HOS2P for a SO-CI, as 2e integrals with 2 core indices
appear in the second order in two ways. There is a mean-
field addition to 1e integrals, which is included when you
choose PARMP=3 or -1. But, there are separate terms from
additional diagrams that are not implemented, so that there
is some imbalance in including the partial 2e correction.
Nevetheless, it may be better to include such "partial"
partial 2e contributions than not to. Note that at first
order in the energy (the CAS-CI states) the N-electron
terms are treated exactly as specified by OPERAT.
1
$TRANST
It is advisable to tighten up the convergence criteria in
the $MCQDx groups since SOC is a fairly small effect, and
the spin-free energies should be accurately computed, for
example THRCON=1e-8 THRGEN=1e-10.
PARMP has a rather different meaning for OPERAT=HSO2FF:
It refers to the difference between ket and bra's Ms,
-1 do matrix elements for ms=-1 only
0 do matrix elements for ms=0 only
1 do matrix elements for ms=1 only
-2 do matrix elements for all ms (0, 1, and -1),
which is the default.
-3 calculates form factors so they can be saved
* * * next defines the orbitals and wavefunctions * * *
NUMCI = For SO-CI, this parameter tells how many CI
calculations to do, and therefore defines how
many $DRTx groups will be read in.
For SO-MCQDPT, this parameter tells how many
MCQDPT calculations to do, and therefore defines
how many $MCQDx groups will be read in.
(default=1)
IROOTS, IVEX, NSTATE, and ENGYST below will all
have NUMCI values. NUMCI may not exceed 64.
You may wish to define one $DRTx or $MCQDx group for each
spatial symmetry representation occuring within each spin
multiplicity, as the use of symmetry during these separate
calculations may make the entire job run much faster.
NUMVEC = the meaning is different depending on the run:
a) spin-orbit CI (SO-CI),
Gives the number of different MO sets. This can
be either 1 or 2, but 2 can be chosen only for
FORS/CASSCF or FCI wavefunctions. (default=1)
If you set NUMVEC=2 and you use symmetry in any
of the $DRTx groups, you may have to use ISTSYM
in the $DRT groups since the order of orbitals
from the corresponding orbital transformation
is unpredictable.
b) spin-orbit perturbation (SO-MCQDPT),
The option to have different MOs for different
states is not implemented, so your job will have
only one $VEC1 group, and IVEX will not normally
be input. The absolute value of NUMVEC should be
be equal to the value of NUMCI above. If NUMVEC
positive, the orbitals in the $VEC1 will be used
exactly as given, whereas if NUMVEC is a negative
number, the orbitals will be canonicalized
according to IFORB in $MCQDx. Using NUMVEC=-NUMCI
and IFORB=3 in all $MCQDx to canonicalize over all
states is recommended.
Note that $GUESS is not read by this RUNTYP! Orbitals must
be in $VEC1 and possibly $VEC2 input groups.
1
$TRANST
NFZC = For SO-CI, this is equal to NFZC in each $DRTx
group. When NUMVEC=2, this is also the number of
identical core orbitals in the two vector sets.
For SO-MCQDPT, this should be NMOFZC+NMODOC given
in each of the $MCQDx groups.
The default is the number of AOs given in $DATA,
this is not very reasonable.
NOCC = the number of occupied orbitals. For SO-CI this
should be NFZC+NDOC+NALP+NAOS+NBOS+NVAL, but
add the external orbitals if the CAS-CI states
are CI-SD or FOCI or SOCI type instead of CAS.
For SO-MCQDPT enter NUMFZC+NUMDOC+NUMACT.
The default is the number of AOs given in $DATA,
which is not usually correct.
Note: IROOTS, NSTATE, ENGYST, IVEX contain NUMCI values.
IROOTS = array containing the number of CAS-CI states to
be used from each CI or MCQDPT calculation.
The default is 1 for every calculation, which is
probably not a correct choice for OPERAT=DM runs,
but is quite reasonable for the HSO operators.
The total number of states included in the SOC
Hamiltonian is the summation of the NUMCI values
of IROOTS times the multiplicity of each CI or
MCQDPT. See also ETOL.
NSTATE = array containing the number of CAS-CI states to be
found by diagonalising the spin-free Hamiltonians.
Of these, the first IROOTS(i) states will be used
to find transition moments or SOC. Obviously,
enter NSTATE(i) >= IROOTS(i).
The default for NSTATE(i) is IROOTS(i), but might
be bigger if you are curious about the additional
energies, or to help the Davidson diagonalizer.
NSTATE is ignored by SO-MCQDPT runs, and you must
ensure that your IROOTS input corresponds to the
KSTATE option in $MCQDx.
ETOL = energy tolerance for CI state elimination.
This applies only to SO-CI and OPERAT=HSO1,2,2P.
After each CI finds NSTATE(i) CI roots for each
$DRTx, the number of states kept in the run is
normally IROOTS(i), but ETOL applies the further
constraint that the states kept be within ETOL of
the lowest energy found for any of the $DRTx.
The default is 100.0 Hartree, so that IROOTS is
the only limitation.
IVEX = Array of indices of $VECx groups to be used for
each CI calculation. The default for NUMVEC=2 is
IVEX(1)=1,2,1,1,1,1,1..., and of course for
NUMVEC=1, it is IVEX(1)=1,1,1,1,1...
This applies only to CITYP=GUGA jobs.
1
$TRANST
ENGYST = energy values to replace the CI spin-free energies.
This parameter applies to SO-CI only.
A possible use for this is to use first or second
order CI energies (FOCI or SOCI in $DRT) on the
diagonal of the Hamiltonian (obtained in some
earlier runs) but to use only CAS wavefunctions
to evaluate off diagonal HSO matrix elements. The
CAS-CI runs are still conducted to obtain CI coefs,
needed to evaluate the off diagonal elements.
Enter MXRT*NUMCI values as a square array, by the
usual FORTRAN convention (that is, MXRT roots of
$DRT1, MXRT roots of $DRT2 etc), in hartrees, with
zeros added to fill each column to MXRT values.
MXRT is the maximum value in the IROOTS array.
(the default is the computed CAS-CI energies)
See B.Schimmelpfennig, L.Maron, U.Wahlgren,
C.Teichteil, H.Fagerli, O.Gropen Chem.Phys.Lett.
286, 261-266(1998).
* * * the next pertain only to spin-orbit runs * * *
RSTATE = sets the zero energy level
format: ndrt*1000+iroot for adiabatic state (CI root)
0000 sets zero energy to the lowest diabatic root
default: 1001 (1st root in $DRT1 or $MCQD1)
ZEFTYP specifies effective nuclear charges to use.
= TRUE uses true nuclear charge of each atom,
except protons are removed if an ECP basis
is being used (default).
= 3-21G selects values optimized for the 3-21G
basis, but these are probably appropriate
for any all electron basis set. Rare gases,
transition metals, and Z>54 will use the
true nuclear charges.
= SBKJC selects a set obtained for the SBKJC ECP
basis set, specifically. It may not be
sensible to use these for other ECP sets.
Rare gases, lanthanides, and Z>86 will use
the true nuclear charges.
ZEFF = an array of effective nuclear charges, overriding
the charges chosen in ZEFTYP.
Note that effective nuclear charges can be used for
any HSO type OPERAT, but traditionally these are used
mainly for HSO1 as an empirical correction to the
omission of the 2e- term, or to compensate for missing
core orbitals in ECP runs.
1
$TRANST
JZ controls the calculation of Jz eigenvalues
= 0 do not perform the calculation
= 1 do the calculation
By default, Jz is set to 1 for molecules that are
recognised as linear (this includes atoms!).
Jz cannot be computed for nonlinear molecules.
The matrix of Jz=Lz+Sz operator is constructed
between spin-mixed states (eigenvalues of Hso).
Setting Jz to 1 can enforce otherwise avoided (by
symmetry) calculations of SOC matrix elements.
JZ applies only to HSO1,2,2P.
TMOMNT = flag to control computation of the transition
dipole moment between spin-mixed wavefunctions
(that is, betweeen eigenvectors of the Pauli-Breit
Hamiltonian). Applies only to HSO1,2,2P.
(default is .FALSE.)
SKIPDM = flag to omit(.TRUE.) or include(.FALSE.) dipole
moment matrix elements during spin-orbit coupling.
Usually it takes almost no addition effort to
calculate excluding some cases when the
calculation of forbidden by symmetry spin-orbit
coupling matrix elements may have to be
performed since and are computed
simultaneously. Applies only to HSO1,2,2P.
Since the lack of a MCQDPT density matrix means
there are no MCQDPT dipole moments at present,
SO-MCQDPT jobs will compute the dipole matrix
elements for the CAS-CI states only. However,
the dipole moments in the spin-mixed states will
be computed with the MCQDPT mixing coefficients.
(default is .TRUE.)
IPRHSO = controls output style for matrix elements (HSO*)
=-1 do not output individual matrix elements
otherwise these are accumulative:
= 0 term-symbol like kind of labelling:
labels contain full symmetry info (default)
= 1 all states are numbered consequently within each
spin multiplicity (ye olde style)
= 2 output only nonzero (>=1e-4) matrix elements
PRTPRM = flag to provide detailed information about the
composition of the spin-mixed states in terms of
adiabatic states. This flag also provides similar
information about Jz (if JZ set).
(default is .FALSE.)
1
$TRANST
* * * expert mode HSO control options * * *
MODPAR = parallel options, which are independent bit
options, 0=off, 1=on. Bit 1 refers only to
HSO2FF, bit 2 to HSO1,2,2P. Enter a decimal
value 0, 1, 2, 3 meaning binary 00, 01, 10, 11.
bit 1 = 0/1 (HSO2FF) uses static/dynamic load balancing in
parallel if available, otherwise use static
load balancing. Dynamic algorithm is usually
faster but may utilize memory less efficiently,
and I/O can slow it down. Also, dynamical
algorithm forces SAVDSK=.F. since its
unique distribution of FFs among nodes implies
no savings from precalculating form factors.
bit 2 = 0/1 (HSO1,2,2P) duplicate/distribute SOC integrals
in parallel. If set, 2e AO integrals and the
four-index transformation are divided over
nodes (distributed), and SOC MO integrals are
then summed over nodes.
The default is 3, meaning both bits are set on (11)
PHYSRC = flag to force the size of the physical record to
be equal to the size of the sorting buffers.
This option can have a dramatic effect on the
efficency. Usually, setting PHYSRC=.t. is helpful
if the code complains that low memory enforces
SLOWFF=.TRUE., or you set it yourself. For large
active spaces and large memory (more precisely, if
reclen is larger than the physical record size)
PHYSRC=.TRUE. can slow the code down. Setting
PHYSRC to .true. forces SLOWFF to be .false.
See MODPAR. (default .FALSE.) (only with HSO2FF)
RECLEN = specifies the size of the record on file 40,
where form factors are stored. This parameter
significantly affects performance.
If not specified, RECLEN have to be guessed,
and the guess will usually be either an
overestimate or underestimate. If the former
you waste disk space, if the latter the program
aborts. Note that RECLEN will be different for
each pair of multiplicities and you must specify
the maximum for all pairs. The meaning of this
number is how many non-zero form factors are
present given four MO indices. You can decrease
RECLEN if you are getting a message "predicted
sorting buffer length is greater than needed..."
Default depends on active space. (only HSO2FF)
SAVDSK = flag to repeat the form factor calculation twice.
This avoids wasting disk space as the actually
required record size is found during the 1st run.
(default=.FALSE.) (only with HSO2FF)
1
$TRANST
SLOWFF = flag to choose a slower FF write-out method.
By default .FALSE., but this is turned on if:
1) not enough memory for the fast way is available
2) the maximum usable memory is available, as when
the buffer is as large as the maximum needed,
then the "slow FF" algorythm is faster.
Generally SLOWFF=.true. saves up to 50% or so of
disk space. See PHYSRC. (only with HSO2FF)
ACTION controls disk file DAFL30 reuse.
= NORMAL calculate the form factors in this run.
= SAVE calculate, and store the form factors on
disk for future runs with the same active
space characteristics.
= READ read the form factors from disk from an
earlier run which used SAVE.
(default=NORMAL) (only with HSO2FF)
Note that currently in order to use ACTION =
SAVE or READ you should specify MS= -1, 0, or 1
* * * some control tolerances * * *
NOSYM= -1 forces use of symmetry-contaminated orbitals
symmetry analysis, otherwise the same as NOSYM=0
= 0 fully use symmetry
= 1 do not use point group symmetry, but still use
other symmetries (Hermiticity, spin).
= 2 use no symmetry. Also, include all CSFs for
HSO1, 2, 2P.
= 3 force the code to assume the symmetry specified
in $DATA is the same as in all $DRT groups, but
is otherwise identical to NOSYM=-1. This option
saves CPU time and money(memory). Since the $DRT
works by mapping non-Abelian groups into their
highest Abelian subgroup, do not use NOSYM=3 for
non-Abelian groups.
SYMTOL = relative error for the matrix elements. This
parameter has a great impact upon CPU time, and
the default has been chosen to obtain nearly
full accuracy while still getting good speedups.
(default=1.0E-4)
1
$TRANST
* * * the remaining parameters are not so important * * *
PRTCMO = flag to control printout of the corresponding
orbitals. (default is .FALSE.)
HSOTOL = HSO matrix elements are considered zero if they
are smaller than HSOTOL. This parameter is used
only for print-out and statistics.
(default=1.0E-1 cm-1)
TOLZ = MO coefficient zero tolerance (as for $GUESS).
(default=1.0E-8)
TOLE = MO coefficient equating tolerance (as for
$GUESS). (default=1.0E-5)
==========================================================
* * * * * * * * * * * * * * * * * * *
For information on RUNTYP=TRANSITN,
see the 'further information' section
* * * * * * * * * * * * * * * * * * *