Spin flipping in ring-coupled-cluster-doubles theory

Wim Klopper, Andrew M. Teale, Sonia Coriani, Thomas Bondo Pedersen, Trygve Helgaker

Research output: Contribution to journalJournal articleResearchpeer-review


We report a critical analysis and comparison of a variety of random-phase-approximation (RPA) based approaches to determine the electronic ground-state energy. Interrelations between RPA variants are examined by numerical examples with particular attention paid to the role of spin-flipped excitations and the behaviour of the adiabatic-connection integrands where appropriate. In general, it is found that RPA variants that include Hartree–Fock exchange contributions are unsuitable as generally applicable methods for the determination of correlation energies. Of the remaining methods only the direct RPA and RPA with second-order screened exchange are recommended for general use.
Original languageEnglish
JournalChemical Physics Letters
Issue number1-3
Pages (from-to)147-153
Publication statusPublished - 2011
Externally publishedYes


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