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Exciton-phonon coupling in molecular crystals: absorption band profiles in the first singlet system of anthracen

Exciton-phonon coupling is analysed in the first singlet absorption system of crystalline anthracene. The prime experimental information is in the band profiles, which are compared with results of a theory connecting them with the coupling of excitons to the external phonon modes. Values of dispersive and exciton-exchange phonon coupling are found from the intermolecular potentials. The calculated profiles agree well. Optimized values of the coupling parameters for exciton-phonon coupling are listed.