Valence bond theory and the neglect of differential overlap
作者:
W.Th.A.M. van der Lugt,
L.J. Oosterhoff,
期刊:
Molecular Physics
(Taylor Available online 1970)
卷期:
Volume 18,
issue 2
页码: 177-190
ISSN:0026-8976
年代: 1970
DOI:10.1080/00268977000100191
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The semi-empirical approximations of Pariser, Parr and Pople (PPP) are used in the valence bond (VB) method. Simple formulas are presented for the calculation of the diagonal and off-diagonal elements of the energy matrix based on the complete set of covalent and polar structures. The method has been applied to butadiene and benzene. In order to interpret theu.v.spectra of these molecules a very large number of polar structures have to be taken into account, whereas in the molecular orbital (MO) theory only a small number of excited configurations are needed. The main advantage of the VB method in comparison with the MO method, using in both cases the PPP approximations, is the simplicity of the expressions for the matrix elements between the VB structures. For the performance of complete calculations therefore the VB method is to be preferred.
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