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Neglect of four- and approximation of one-, two-, and three-center two-electron integrals in a symmetrically orthogonalized basis
Stockholm University, Faculty of Science, Department of Physics.
2007 (English)In: Journal of Computational Chemistry, ISSN 0192-8651, E-ISSN 1096-987X, Vol. 28, no 3, 698-702 p.Article in journal (Refereed) Published
Abstract [en]

A new integral approximation for use in molecular electronic structure calculations is proposed as an alternative to the traditional neglect of diatomic differential overlap models. The similarity between the symmetrically orthogonalized and the original basis functions (assumed orthonormal within each atomic set but nonorthogonal between different centers) is used to construct a robust approximation for the two-electron integrals, with the error being quadratic in the deviation between the products of the functions. Invariance proper-ties of this procedure are rigorously proved. Numerical studies on a representative set of molecules at valence-only minimal basis Hartree-Fock level show that the approximation introduces relatively small errors, encouraging its future application in the semiempirical field. 

Place, publisher, year, edition, pages
2007. Vol. 28, no 3, 698-702 p.
Keyword [en]
integral approximation, symmetric orthogonalization, serniemperical methods, differential overlap
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-57512DOI: 10.1002/jcc.20485ISI: 000243762800008OAI: diva2:416227
authorCount :1Available from: 2011-05-11 Created: 2011-05-11 Last updated: 2011-05-11Bibliographically approved

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