18.1.15 HCTH120:

A. D. Boese, N. L. Doltsinis, N. C. Handy and M. Sprik, J. Chem. Phys. 112, 1670 (2000)

HTCH optimized on a set of 120 training systems extending the set of HCTH93 to include Anionic atoms and molecules, 2$^{nd}$ row anions and H-bonded dimers.

$$A = [ 0.51473, 6.9298,- 24.707, 23.110,- 11.323] ,$$ (72)

$$B = [ 0.48951,- 0.2607, 0.4329,- 1.9925, 2.4853] ,$$ (73)

$$C = [ 1.09163,- 0.7472, 5.0783,- 4.1075, 1.1717]$$ (74)

and

$$\lambda = [ 0.006, 0.2, 0.004] .$$ (75)