Anisotropic repulsive potential energy surfaces from Hartree-Fock calculations for HeCO2 and HeOCS

Mark Keil, Leslie J. Rawluk, Thomas W. Dingle

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Hartree-Fock calculations are presented for the repulsive interactions of He with CO2 and OCS. The results are well described by parametrizing the anisotropic potential energy surface as a sum over interactions between He and each atom of the molecule. The interaction of He with the oxygen ends of both molecules is almost identical, thereby reducing the number of potential fitting parameters required. The analytic surfaces obtained yield good agreement with pressure broadening measurements, which probe the anisotropy while being independent of the van der Waals attraction. It is suggested that the sum-over-sites parametrization may be useful in constructing semiempirical surfaces that do include the van der Waals attraction. The sum-over-sites parametrization is also particularly well suited to describing the vibrational dependence of the repulsive anisotropy.

Original languageEnglish
Pages (from-to)6621-6628
Number of pages8
JournalJournal of Chemical Physics
Volume96
Issue number9
DOIs
StatePublished - 1 Jan 1992
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (all)
  • Physical and Theoretical Chemistry

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