Accelerating convergence in the antisymmetric product of strongly orthogonal geminals method

Moto Tarumi, Masato Kobayashi, Hiromi Nakai

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Antisymmetric product of strongly orthogonal geminals (APSG) method is a wavefunction theory that can effectively treat the static electron correlation using two-electron wavefunctions, called geminals. However, the APSG method has the problem of slow convergence in the optimization of the geminal function. In this study, we introduced the direct inversion in the iterative subspace (DIIS) method, for both closed- and open-shell systems, for accelerating its convergence. Two types of error vectors, that is, unitary transformation and orbital gradient, were examined for the DIIS procedure. Numerical assessments revealed that the orbital-gradient error vector shows better performance than the unitary-transformation one.

Original languageEnglish
Pages (from-to)239-244
Number of pages6
JournalInternational Journal of Quantum Chemistry
Volume113
Issue number3
DOIs
Publication statusPublished - 2013 Feb 5

Keywords

  • antisymmetric product of strongly orthogonal geminals method
  • direct inversion in the iterative subspace method
  • static electron correlation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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