A simple and efficient CCSD(T)-F12 approximation

Thomas B. Adler, Gerald Knizia, Hans Joachim Werner

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Abstract

A new explicitly correlated CCSD(T)-F12 approximation is presented and tested for 23 molecules and 15 chemical reactions. The F12 correction strongly improves the basis set convergence of correlation and reaction energies. Errors of the Hartree-Fock contributions are effectively removed by including MP2 single excitations into the auxiliary basis set. Using aug-cc-pVTZ basis sets the CCSD(T)-F12 calculations are more accurate and two orders of magnitude faster than standard CCSD(T)/aug-cc-pV5Z calculations.

Original languageEnglish (US)
Article number221106
JournalJournal of Chemical Physics
Volume127
Issue number22
DOIs
StatePublished - Dec 20 2007

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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