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Cited by 1,004

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A post-Hartree–Fock model of intermolecular interactions

Johnson, Erin R., Becke, Axel D.·2005·The Journal of Chemical Physics

Abstract

Intermolecular interactions are of great importance in chemistry but are difficult to model accurately with computational methods. In particular, Hartree–Fock and standard density-functional approximations do not include the physics necessary to properly describe dispersion. These methods are sometimes corrected to account for dispersion by adding a pairwise C6∕R6 term, with C6 dispersion coefficients dependent on the atoms involved. We present a post-Hartree–Fock model in which C6 coefficients are generated by the instantaneous dipole moment of the exchange hole. This model relies on occupied orbitals only, and involves only one, universal, empirical parameter to limit the dispersion energy at small interatomic separations. The model is extensively tested on isotropic C6 coefficients of 178 intermolecular pairs. It is also applied to the calculation of the geometries and binding energies of 20 intermolecular complexes involving dispersion, dipole-induced dipole, dipole–dipole, and hydrogen-bonding interactions, with remarkably good results.

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Crossref · 10.1063/1.1949201

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Metadata

Authors
Johnson, E. R., & Becke, A. D.
Venue
The Journal of Chemical Physics
Published
2005-07-08
Volume
123
Issue
2
Pages
24101-24101
ISSN
  • 0021-9606 (ISSN-L)
  • 1089-7690
OpenAlex
W2034465848
Cited by
1,004
References
1
FWCI
10.66
Type
journal article
Language
en
Open access
closed

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