A direct atomic orbital driven implementation of the coupled cluster singles and doubles (CCSD) model

The coupled cluster singles and doubles (CCSD) model has been implemented using a direct atomic integral driven technique. The atomic integrals are generated in distributions with one fixed and three free indices, and one distribution is stored in fast memory together with the cluster amplitudes and the cluster vector function. Little loss in efficiency has been obtained compared to a molecular orbital integral driven technique. Sample calculations are presented for HFCO containing 328 basis functions.

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