Journal of Mathematical Chemistry

, Volume 54, Issue 2, pp 572–591 | Cite as

Calculation of STOs electron repulsion integrals by ellipsoidal expansion and large-order approximations

Original Paper

Abstract

For general two-electron two-centre integrals over Slater-type orbitals (STOs), the use of the Neumann expansion for the Coulomb interaction potential yields infinite series in terms of few basic functions. In many important cases the number of terms necessary to achieve convergence by a straightforward summation is large and one is forced to calculate the basic integrals of high order. We present a systematic approach to calculation of the higher-order terms in the Neumann series by large-order expansions of the basic integrals. The final expressions are shown to be transparent and straightforward to implement, and all auxiliary quantities can be calculated analytically. Moreover, numerical stability and computational efficiency are also discussed. Results of the present work can be used to speed up calculations of the STOs integral files, but also to study convergence of the Neumann expansion and develop appropriate convergence accelerators.

Keywords

Slater-type orbitals Two-electron integrals Large-order expansion Neumann series 

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Faculty of ChemistryUniversity of WarsawWarsawPoland

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