20.1 Structure of the input

All sub-commands known to MULTI may be abbreviated by four letters. The input commands fall into several logical groups; within each group commands may appear in any order, but the groups must come in correct order.

a)

The program is invoked by the command MULTI or MCSCF

b)

cards defining partitioning of orbitals spaces - OCC,CORE,CLOSED

c)

general options (most commands not otherwise specified here)

d)

a WF card defining a state symmetry

e)

options pertaining to that state symmetry - WEIGHT,STATE,LQUANT

f)

configuration specification for that state symmetry - SELECT,CON,RESTRICT

g)

definition of the primary configurations for that state symmetry - PSPACE

h)

further general options

Stages d) through to h) may be repeated several times; this is the way in which you specify an average energy of several states of different symmetry.