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- W2032651181 abstract "In this paper, we present a diabatization scheme to compute the excitonic couplings between an arbitrary number of states in molecular pairs. The method is based on an algebraic procedure to find the diabatic states with a desired property as close as possible to that of some reference states. In common with other diabatization schemes, this method captures the physics of the important short-range contributions (exchange, overlap, and charge-transfer mediated terms) but it becomes particularly suitable in presence of more than two states of interest. The method is formulated to be usable with any level of electronic structure calculations and to diabatize different types of states by selecting different molecular properties. These features make the diabatization scheme presented here especially appropriate in the context of organic crystals, where several excitons localized on the same molecular pair may be found close in energy. In this paper, the method is validated on the tetracene crystal dimer, a well characterized case where the charge transfer (CT) states are closer in energy to the Frenkel excitons (FE). The test system was studied as a function of an external electric field (to explore the effect of changing the relative energy of the CT excited state) and as a function of different intermolecular distances (to probe the strength of the coupling between FE and CT states). Additionally, we illustrate how the approximation can be used to include the environment polarization effect." @default.
- W2032651181 created "2016-06-24" @default.
- W2032651181 creator A5057989790 @default.
- W2032651181 creator A5089848606 @default.
- W2032651181 date "2015-04-28" @default.
- W2032651181 modified "2023-09-27" @default.
- W2032651181 title "Excitonic couplings between molecular crystal pairs by a multistate approximation" @default.
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- W2032651181 doi "https://doi.org/10.1063/1.4919241" @default.
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