Volume 25, Issue 16 pp. 1987-1994

Efficiency of the algorithms for the calculation of Slater molecular integrals in polyatomic molecules

J. Fernández Rico

J. Fernández Rico

Departamento de Química Física Aplicada, Facultad de Ciencias C-XIV, E-28049, Universidad Autónoma de Madrid, 28049 Madrid, Spain

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R. López

Corresponding Author

R. López

Departamento de Química Física Aplicada, Facultad de Ciencias C-XIV, E-28049, Universidad Autónoma de Madrid, 28049 Madrid, Spain

Departamento de Química Física Aplicada, Facultad de Ciencias C-XIV, E-28049, Universidad Autónoma de Madrid, 28049 Madrid, SpainSearch for more papers by this author
I. Ema

I. Ema

Departamento de Química Física Aplicada, Facultad de Ciencias C-XIV, E-28049, Universidad Autónoma de Madrid, 28049 Madrid, Spain

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G. Ramírez

G. Ramírez

Departamento de Química Física Aplicada, Facultad de Ciencias C-XIV, E-28049, Universidad Autónoma de Madrid, 28049 Madrid, Spain

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First published: 07 October 2004
Citations: 54

Abstract

The performances of the algorithms employed in a previously reported program for the calculation of integrals with Slater-type orbitals are examined. The integrals are classified in types and the efficiency (in terms of the ratio accuracy/cost) of the algorithm selected for each type is analyzed. These algorithms yield all the one- and two-center integrals (both one- and two-electron) with an accuracy of at least 12 decimal places and an average computational time of very few microseconds per integral. The algorithms for three- and four-center electron repulsion integrals, based on the discrete Gauss transform, have a computational cost that depends on the local symmetry of the molecule and the accuracy of the integrals, standard efficiency being in the range of eight decimal places in hundreds of microseconds. © 2004 Wiley Periodicals, Inc. J Comput Chem 25: 1987–1994, 2004

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