Molecular symmetry. IV. The coupled perturbed Hartree–Fock method

Toshikazu Takada, Michel Dupuis, Harry F. King

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Symmetry methods employed in the ab initio polyatomic program HONDO are extended to the coupled perturbed Hartree–Fock (CPHF) formalism, a key step in the analytical computation of energy first derivatives for configuration interaction (CI) wavefunctions, and energy second derivatives for Hartree–Fock (HF) wavefunctions. One possible computational strategy is to construct Fock‐like matrices for each nuclear coordinate in which the one‐ and two‐electron integrals of the usual Fock matrix are replaced by the integral first derivatives. “Skeleton” matrices are constructed from the unique blocks of electron‐repulsion integral derivatives. The correct matrices are generated by applying a symmetrization operator. The analysis is valid for many wavefunctions, including closed‐ or open‐shell spin‐restricted and spin‐unrestricted HF wavefunctions. To illustrate the method, we compare the computer time required for setting up the coupled perturbed HF equations for eclipsed ethane using D3h symmetry point group and various subgroups of D3h. Computational times are roughly inversely proportional to the order of the point group.

Original languageEnglish
Pages (from-to)234-240
Number of pages7
JournalJournal of Computational Chemistry
Issue number2
Publication statusPublished - 1983

ASJC Scopus subject areas

  • Chemistry(all)
  • Computational Mathematics

Fingerprint Dive into the research topics of 'Molecular symmetry. IV. The coupled perturbed Hartree–Fock method'. Together they form a unique fingerprint.

Cite this