Journal
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
Volume 11, Issue 8, Pages 3636-3642Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jctc.5b00429
Keywords
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Funding
- Office of Basic Energy Sciences, U.S. Department of Energy [DE-FG02-13ER16398]
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We report the derivation and implementation of orbital optimization algorithms for the active space decomposition (ASD) model, which are extensions of complete active space self-consistent field (CASSCF) and its occupation-restricted variants in the conventional multiconfiguration electronic-structure theory. Orbital rotations between active subspaces are included in the optimization, which allows us to unambiguously partition the active space into subspaces, enabling application of ASD to electron and exciton dynamics in covalently linked chromophores. One- and twoparticle reduced density matrices, which are required for evaluation of orbital gradient and approximate Hessian elements, are computed from the intermediate tensors in the ASD energy evaluation. Numerical results on 4-(2-naphthylmethyl)-benzaldehyde and [3(6)]cyclophane and model Hamiltonian analyses of triplet energy transfer processes in the Closs systems are presented. Furthermore, model Hamiltonians for hole and electron transfer processes in anti-[2.2] (1,4)pentacenophane are studied using an occupation-restricted variant.
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