Abstract

The self-consistent electron pairs (SCEP) method is an efficient iterative scheme for the calculation of correlated molecular wavefuctions. Previous formulations of SCEP were restricted to closed shell reference states, but presented here is an extended SCEP theory for correlating open shell electrons with parallel spins, such as in triplet and quartet states. This demonstrates the applicability of SCEP to a larger class of molecular systems with the same computational efficiency as with closed shell systems.

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