Frenkel Excitons in a Vibrating Molecular Crystal

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Abstract
This paper is concerned with a study of the interaction between collective electronic excitations and collective vibrational excitations in a molecular crystal. A strong coupling theory is developed and is used to calculate the vibrational structure of the collective excitation in the Frenkel limit. The frequency dependence of the self‐energy of the excitation and dispersion in the optical phonon branch of the vibrational spectrum are included in the analysis. The line shapes in the absorption spectrum of a molecular crystal are considered for the two limiting cases of exciton–phonon coupling—namely weak and strong coupling. One of the topics considered in detail is the damping of the zero phonon transition.
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