Abstract
The Ridley–Babiker relation for the LO-phonon energy is used to obtain an exact formula for the exciton scattering rate in the one-phonon approximation. The effect of LO-phonon dispersion on the frequency and temperature dependence of the exciton attenuation is studied theoretically for models of polar crystals with large and small exciton radii. It is shown that the role of LO-phonon dispersion is essentially different in processes with phonon absorption and phonon emission. For some fixed frequency interval, it is established that the effect of dispersion on exciton scattering changes with temperature. The TlBr and ZnS crystals are used as models for illustrations.
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