Abstract
A simple dimer model is used to demonstrate that in weakly allowed Frenkel exciton states, where the factor-group splitting is largely due to charge transfer interactions, the exciton-phonon coupling constant may be considerably different for the two Davydov components. The model is applied to the S 1 transition of the naphthalene crystal and suggests a smaller Davydov splitting than normally assumed (60 cm −1 rather than 150 cm −1).
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