Abstract
A model based on the Förster mechanism of excitation transfer is used to analyse the migration of excitation within a molecular aggregate composed of identical molecules arranged in tetrahedral symmetry. In this model, the classical electronic potential surfaces are constructed considering a single vibrational coordinate that represents the alteration in equilibrium position upon excitation of each molecule. Conditions for excitation localization and transfer are described in terms of composite nuclear displacements and the magnitude of the resonance interaction between molecules.
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