Near-degeneracy corrections for second-order perturbation theory: Comparison of two approaches

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We compare two approximate perturbation schemes which were developed recently to deal with the (quasi)degeneracy problem in many-body perturbation theory. We conclude that although the two methods were introduced on quite different theoretical grounds, their performances are quite similar, and present an improvement over traditional perturbation theory. Both methods are cheap in computation time, but cannot compete in accuracy with more sophisticated schemes such as complete-active-space perturbation theory or dressed particle theories.

Original languageEnglish
Pages (from-to)408-412
Number of pages5
JournalTheoretical Chemistry Accounts
Issue number6
Publication statusPublished - máj. 1 2001


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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