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##

37.1 Introduction

The SAPT (symmetry-adapted intermolecular perturbation theory) program
calculates the total interaction energy between closed-shell molecules as a
sum of individual first and second order interaction terms, namely
electrostatic
, induction
and
dispersion
accompanied by their respective exchange
counterparts (
,
and
). The latter ones arise due to electron exchange
between the monomers when the molecules are close to each other and are
sometimes denoted as Pauli repulsion. Since all above terms are accessible
through density matrices and static and dynamic density-density response
functions of the monomers, in principle (see section 37.4) no
calculation of the dimer wave function is required. Therefore SAPT is free
from the basis set superposition error which occurs in the supermolecular
approach.
References:

**General Symmetry-adapted perturbation theory and many-body SAPT:**

B. Jeziorski, R. Moszynski and K. Szalewicz,
Chem. Rev. **94**, 1887. (1994).

**DFT-SAPT:**

G. Jansen and A. Heßelmann,
J. Phys. Chem. A **105**, 646 (2001).

A. Heßelmann and G. Jansen,
Chem. Phys. Lett. **357**, 464 (2002).

A. Heßelmann and G. Jansen,
Chem. Phys. Lett. **362**, 319 (2002).

A. Heßelmann and G. Jansen,
Chem. Phys. Lett. **367**, 778 (2003).

A. Heßelmann and G. Jansen,
Phys. Chem. Chem. Phys. **5**, 5010 (2003).

**Density fitting DFT-SAPT (DF-DFT-SAPT):**

A. Heßelmann, G. Jansen and M. Schütz,
J. Chem. Phys. **122**, 014103 (2005).

**Density fitting DFT-SAPT for arbitrary monomer basis sets (DFSAPT):**

A. Heßelmann and T. Korona,
J. Chem. Phys. **141**, 094107 (2014).

(See also:

K. Szalewicz, K. Patkowski and B. Jeziorski,
Struct. Bond **116**, 43 (2005)

K. Szalewicz, WIREs Comput. Mol. Sci. **2**, 254 (2011)

and references therein for a related approach to DFT-SAPT termed SAPT(DFT))

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molpro@molpro.net 2018-04-21