Two perturbations in the presence of degeneracy

C. D.H. Chisholm, K. B. Lodge

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The second-order energy in Rayleigh-Schrödinger single perturbation theory for a degenerate level with two perturbations is written in "double perturbation" form. The difficulties in formal double perturbation theory are avoided.

Original languageEnglish (US)
Pages (from-to)571-574
Number of pages4
JournalChemical Physics Letters
Issue number4
StatePublished - Sep 1 1972

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