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- W2065431444 abstract "The exciton–lattice interaction cannot be treated adiabatically in many molecular crystals where the exciton bandwidth is at most comparable to lattice-vibration energies. It cannot also be treated perturbationally at about room temperatures where the absorption line width of excitons is comparable to the larger of the exciton bandwidth and lattice-vibration energies in most molecular crystals. A simple model which describes excitons in molecular crystals from a unified viewpoint is proposed. The model has three characteristic energies: the half-width B of the exciton band, the average amplitude of the scattering potential for excitons produced by lattice vibrations D, and the inverse of the correlation time of the potential fluctuation γ on the order of lattice-vibration energies in units of C=1. It describes singlet excitons when B≳γ and triplet excitons when B≪γ. The dynamical-coherent-potential approximation applied to this model bridges reasonably the following two limits: the strong-scattering limit for D≫B and D≫γ in which the exciton absorption has a Gaussian line shape, and the weak-scattering limit for D≪B or D≪γ in which the exciton absorption has a motionally narrowed Lorentzian line shape. The exponentially decreasing low-energy absorption tail, obeying the Urbach–Martienssen rule, grows up as B/γ increases towards the adiabatic limit of B/γ ≫1. The model is consistently applied to observed exciton spectra in various molecular crystals." @default.
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- W2065431444 date "1977-10-01" @default.
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- W2065431444 title "Exciton–lattice interaction and the line shape of exciton absorption in molecular crystals" @default.
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- W2065431444 doi "https://doi.org/10.1063/1.435259" @default.
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