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Multi-component molecular orbital theory for electrons and nuclei including many-body effect with full configuration interaction treatment: isotope effects on hydrogen molecules

Authors
Journal
Chemical Physics Letters
0009-2614
Publisher
Elsevier
Publication Date
Volume
360
Identifiers
DOI: 10.1016/s0009-2614(02)00881-3
Disciplines
  • Physics

Abstract

Abstract A multi-component molecular orbital (MC_MO) theory is developed for a combined quantum system of electrons and nuclei with the full configuration interaction (CI) scheme of Cartesian Gaussian-type functions. The technique of graphical unitary group approach (GUGA) is modified to obtain the CI matrix elements for many kinds of quantum particles efficiently. The optimum basis sets for quantum nuclei are proposed with the fully variational procedure. The average internuclear distances, dipole polarizabilities, and nuclear vibrational excitation energies for isotopic hydrogen molecules calculated with optimized basis sets are found to adequately reproduce the corresponding experimental values.

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