Multiplet and Phonon Structure in Mixed Crystal Spectra: Anthracene in p-Terphenyl

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Abstract
The origin and molecular vibronic bands in the absorption and fluorescence spectra of anthracene‐h10 and ‐d10 dissolved in p‐terphenyl exhibit a multiplet structure consisting of several components with a maximum multiplet splitting of about 250 cm−1. The phonon structure originating from the multiplet component origins is very different and the spectral phonon shapes consist of sharp peaks (bandwidths ∼1 cm−1) superimposed on a broad band. A theory of electron–phonon coupling is presented which suggests that the sharp phonon bands are due to pseudolocalized phonon modes and the broad bands due to delocalized phonon modes.

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