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General formalism of vibronic Hamiltonians for tetrahedral and octahedral systems: problems that involve A-type states and a-type vibrations
(Elsevier, 2018-11-14)
In this work, we derive expansion formulas up to arbitrary order in vibrational coordinates for the tetrahedral and octahedral vibronic Hamiltonians that involve A-type states and a-type vibrations. The root-branch approach ...