Novel orthogonalization and biorthogonalization algorithms

Towards multistate multiconfiguration perturbation theory

Zsuzsanna Tóth, Péter R. Nagy, Péter Jeszenszki, A. Szabados

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Orthogonalization with the prerequisite of keeping several vectors fixed is examined. Explicit formulae are derived both for orthogonal and biorthogonal vector sets. Calculation of the inverse or square root of the entire overlap matrix is eliminated, allowing computational time reduction. In this special situation, it is found sufficient to evaluate the functions of matrices of the dimension matching the number of fixed vectors. The (bi)orthogonal sets find direct application in extending multiconfigurational perturbation theory to deal with multiple reference vectors.

Original languageEnglish
Article number100
JournalTheoretical Chemistry Accounts
Volume134
Issue number8
DOIs
Publication statusPublished - Aug 4 2015

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perturbation theory
matrices

Keywords

  • Biorthogonal sets
  • Multiconfiguration perturbation theory
  • Multistate theory
  • Orthogonalization
  • Overlap

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Novel orthogonalization and biorthogonalization algorithms : Towards multistate multiconfiguration perturbation theory. / Tóth, Zsuzsanna; Nagy, Péter R.; Jeszenszki, Péter; Szabados, A.

In: Theoretical Chemistry Accounts, Vol. 134, No. 8, 100, 04.08.2015.

Research output: Contribution to journalArticle

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