Degeneracy-corrected perturbation theory for electronic structure calculations

Xavier Assfeld, Jan E. Almlöf, Donald G. Truhlar

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

The second-order perturbative treatment of molecular electronic energies is modified in a way that takes account of near-degeneracy effects. The resulting formalism (DCPT2) is just as easy to apply as the popular second-order Moller-Plesset theory (also called second-order many-body perturbation theory) but is more accurate because it is less sensitive to near-degeneracy effects. Illustrative calculations are reported for a series of small molecules, showing significant improvement for cases with lone pairs on vicinal atoms.

Original languageEnglish (US)
Pages (from-to)438-444
Number of pages7
JournalChemical Physics Letters
Volume241
Issue number4
DOIs
StatePublished - Jul 28 1995

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