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Møller–Plesset perturbation theory applied to vibrational problems

J. Chem. Phys. 105, 11261 (1996); doi:10.1063/1.472922

Issue Date: 22 December 1996

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Lawrence S. Norris
Departments of Biomedical Engineering and Chemistry, Northwestern University, Evanston, Illinois 60208

Mark A. Ratner and Adrian E. Roitberg
Department of Chemistry, Northwestern University, Evanston, Illinois 60208

R. B. Gerber
Department of Physical Chemistry and The Fritz Haber Research Center, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Department of Chemistry, University of California-Irvine, Irvine, California 92717

Møller–Plesset perturbation theory is employed to improve the accuracy of static mean field computations in molecular vibration problems. This method is a simple and efficient way to get nearly exact frequencies for few-mode model potentials. For more realistic potentials representing the dynamics of water and formaldehyde, the Møller–Plesset treatment works equally as well. However, we find in general that MP2 level corrections give very accurate energies and additional corrections by higher level terms in the MP series are not substantial. Moreover, we find that for reference states on high energy manifolds degeneracies can result when higher level terms are included in the series. We discuss several ways to remove these degeneracies. ©1996 American Institute of Physics.
History: Received 26 June 1996; accepted 16 September 1996
Permalink: http://link.aip.org/link/?JCPSA6/105/11261/1
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KEYWORDS and PACS

Keywords
PACS
  • 31.10.+z
    Electronic structure of atoms, molecules and their ions: theory Theory of electronic structure, electronic transitions, and chemical binding
  • 31.15.Md
    Electronic structure of atoms, molecules and their ions: theory Calculations and mathematical techniques in atomic and molecular physics (excluding electron correlation calculations) Perturbation theory
  • 31.15.Ne
    Electronic structure of atoms, molecules and their ions: theory Calculations and mathematical techniques in atomic and molecular physics (excluding electron correlation calculations) Self-consistent-field methods
  • YEAR: 1996

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

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