Very accurate correlated calculations on diatomic molecules with numerical orbitals: The hydrogen fluoride molecule

Ludwik Adamowicz, Rodney J. Bartlett

Research output: Contribution to journalArticle

23 Scopus citations


Numerical orbital coupled-cluster calculations on the FH molecule are reported, which obtain 99% of the possible correlation energy. Instead of requiring explicit r12 functions, it is demonstrated that a one-particle but very well-chosen numerical orbital basis set is adequate to recover essentially all effects of electron correlation. Further reduction of the dimension of the numerical orbital basis set is accomplished via our recently proposed optimized virtual-orbital-space technique. Augmented by the exact second-order energy, the latter allows a reduction to as small as 25% of the original space with no appreciable errors in the correlation energy.

Original languageEnglish (US)
Pages (from-to)1-5
Number of pages5
JournalPhysical Review A
Issue number1
Publication statusPublished - 1988
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Atomic and Molecular Physics, and Optics

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