grimmedisp
This option defines how to apply Grimme dispersion correction version 3, i.e. DFT-D3.
When there is no grimmedisp
in the input file, no DFT-D3 will be applied.
type
Value | bj Becke-Johnson DFT-D3 form |
zero Zero-damp DFT-D3 form |
|
Default | None |
Define form of DFT-D3. There is no default value and you must assign bj
or zero
.
In most cases, bj
is better, but for some functionals, like M06, M062X, and M06HF, only zero
is available.
three_body
Add three body corrections in DFT-D3. This is useful for large systems.
tz
If triple zeta basis sets are used, this keyword may bring some improvement.