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Three- and four-electron integrals involving Gaussian geminals: Fundamental integrals, upper bounds, and recurrence relations.
Journal of Chemical Physics 2017 July 15
We report the three main ingredients to calculate three- and four-electron integrals over Gaussian basis functions involving Gaussian geminal operators: fundamental integrals, upper bounds, and recurrence relations. In particular, we consider the three- and four-electron integrals that may arise in explicitly correlated F12 methods. A straightforward method to obtain the fundamental integrals is given. We derive vertical, transfer, and horizontal recurrence relations to build up angular momentum over the centers. Strong, simple, and scaling-consistent upper bounds are also reported. This latest ingredient allows us to compute only the O(N2 ) significant three- and four-electron integrals, avoiding the computation of the very large number of negligible integrals.
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