Abstract

Vibronic coupling in excited charge transfer states of crystalline donor—acceptor complexes is reconsidered in relationship to recent electromodulation experiments for anthracene—PMDA. It is demonstrated that vibronic coupling, both linear and quadratic, may substantially affect the electric field dependence of the eigenstates, which may explain, at least semiquantitatively, the observed behaviour. Some consequences for experimental determination of dipole moments by means of electromodulation spectroscopy are pointed out.

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