I was wondering if there are some publications regarding the SAPT module of PSI4? If yes how can I find it?
The manual is a good start.
Actually @hokru I am bit confused about which module to try. I have optimized my geometry at RI mp2/aug-cc-pvtz. The systems have around 15 atoms and closed shell. Which sapt module should I use for most accurate calculation? Sapt 2+3 or sapt 2+3(ccsd)?
This is a good paper suggesting different levels of quality for SAPT levels and having an eye on the computational demand:
https://aip.scitation.org/doi/abs/10.1063/1.4867135
Sticking to their gold-level is a good choice.
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