Among the two electron integrals occurring in the molecular context, the threecenter Coulomb and hybrid integrals are numerous and difficult to evaluate to high accuracy. The analytical and numerical difficulties arise mainly from the presence of the spherical Bessel function and hypergeometric seri
Rapid evaluation of two-center two-electron integrals
β Scribed by Peter M. W. Gill; Andrew T. B. Gilbert; Terry R. Adams
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 157 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0192-8651
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π SIMILAR VOLUMES
Two-electron, four-center Coulomb integrals are undoubtedly the most difficult type involved in ab initio and density functional theory molecular structure calculations. Millions of such integrals are required for molecules of interest; therefore rapidity is the primordial criterion when the precisi
The new translation method for Slater-type orbitals (STOs) previously tested in the case of the overlap integral is extended to the calculation of two-center two-electron molecular integrals. The method is based on the exact translation of the regular solid harmonic part of the orbital followed by t
## Abstract For Abstract see ChemInform Abstract in Full Text.
In a previous article (J. Fernandez Rico, R. Upez and G. Ramirez, J. Comp. Chem., 9, 790 (1988)) we have proposed the calculation of molecular integrals involving STOs by means of some recurrence relations which use two sets (h and H) of overlap integrals (basic matrices). In the present paper, we d