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Faster finite‐difference calculations of molecular properties
Author(s) -
Mullally D. J.,
McIver J. W.
Publication year - 1983
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.540040413
Subject(s) - mindo , wave function , finite difference , perturbation theory (quantum mechanics) , computational chemistry , perturbation (astronomy) , statistical physics , physics , molecule , chemistry , mathematics , quantum mechanics , mathematical analysis
A very simple yet effective device for reducing the number of self‐consistent‐field (SCF) cycles in central finite‐difference calculations of molecular properties is presented. The efficiency of this is demonstrated by MINDO/2 calculations of the force constants of a variety of molecules. The device consists of using information about the wavefunction at two values of a perturbation parameter to provide an estimate of the wavefunction at a third. This estimate is then used as an initial guess in an SCF procedure. The underlying theory is discussed and applications to other problems are suggested.