Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 152, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/5.0005093
Keywords
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Funding
- U.S. Army Research Laboratory
- Army Research Office [W911NF-19-1-0117]
- NSF [CHE-1900551]
- Polish National Science Centre [2015/17/B/ST4/03727]
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Symmetry-adapted perturbation theory (SAPT) is a method for calculations of intermolecular (noncovalent) interaction energies. The set of SAPT codes that is described here, the current version named SAPT2020, includes virtually all variants of SAPT developed so far, among them two-body SAPT based on perturbative, coupled cluster, and density functional theory descriptions of monomers, three-body SAPT, and two-body SAPT for some classes of open-shell monomers. The properties of systems governed by noncovalent interactions can be predicted only if potential energy surfaces (force fields) are available. SAPT is the preferred approach for generating such surfaces since it is seamlessly connected to the asymptotic expansion of interaction energy. SAPT2020 includes codes for automatic development of such surfaces, enabling generation of complete dimer surfaces with a rigid monomer approximation for dimers containing about one hundred atoms. These codes can also be used to obtain surfaces including internal degrees of freedom of monomers.
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