dftd3 / simple-dftd3

reimplementation of the DFT-D3 program
https://dftd3.readthedocs.io
GNU Lesser General Public License v3.0
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Support for D3(CSO) damping function #5

Open awvwgk opened 2 years ago

awvwgk commented 2 years ago

Add support for the CSO damping scheme proposed in https://pubs.acs.org/doi/10.1021/acs.jctc.5b00400.

Four parameter form

$$E\text{disp} = - \sum\text{AB}\left(s_6 + \frac{a1}{1+\exp[R\text{AB} - a_2 R_0^\text{AB}]}\right)\times \frac{C6}{R^6\text{AB} + (a_3 R_0^\text{AB} + a_4)^6}$$

One parameter form

$$E\text{disp} = - \sum\text{AB}\left(s_6 + \frac{a1}{1+\exp[R\text{AB} - 2.5 R_0^\text{AB}]}\right)\times \frac{C6}{R^6\text{AB} + (2.5^2)^6}$$

Published parameters

functional s6 a1
BLYP 1.0 1.28
BP86 1.0 1.01
PBE 1.0 0.24
TPSS 1.0 0.72
B3LYP 1.0 0.86
PBE0 1.0 0.20
PW6B95 1.0 -0.15
B2PLYP 0.73 0.24

Potential issues: