Free and self-trapped excitons in cryocrystals: kinetics and relaxation processes

Abstract This review paper deals with the principal problems of electronic excitation evolution in rare-gas cryocrystals which are connected with the non-trivial physical phenomenon of the coexistence of free and self-trapped excitons. Numerous data on luminescence spectra of cryocrystals in the frequency range from visible to extreme ultraviolet are analysed. Temperature and time characteristics of the spectra are considered. From this point of view various processes are discussed; namely, the exciton-phonon interaction and polariton effects, the mechanisms of self-trapped barrier overcoming, the relaxation processes and defect formation under excitation self-trapping, and the kinetics of excitons and energy transfer.

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