On the valence bond diatomics-in-molecules method. I. A projection operator reformulation

Michael B. Faist, James Muckerman

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Abstract

A rederivation of the diatomics-in-molecules (DIM) method for obtaining potential energy surfaces is presented in terms of projections onto fragment diatomic and atomic subspaces. This approach renders the approximations inherent in the DIM method transparent. The method is considered from both ab initio and semiempirical viewpoints. Nonadiabatic and spin-orbit coupling in the fragments is discussed. Comparison with previous DIM formulations is made.

Original languageEnglish
Pages (from-to)225-232
Number of pages8
JournalJournal of Chemical Physics
Volume71
Issue number1
Publication statusPublished - 1979

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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