Abstract
In the present paper we report a vibronic model for the absorption bands of theCr2+ ion inCdSe and CdSe0.6S0.4 crystals. For the most probable impurity clusters,CrSe4,CrSe3S,CrSeS3 and CrSe2S2, the crystal field splittings and the vibronic coupling parameters are estimated with the aid ofthe exchange charge model of the crystal field accounting for the exchange and covalence effects.On this basis the transitions responsible for the formation of the optical bands arising from theCrSe4,CrSe3S,CrSeS3 and CrSe2S2 species are determined and the profiles of the absorption bandscorresponding to these species are calculated. The total spectrum of theCdSe0.6S0.4:Cr2+ crystal is obtained by summation over partial spectra arising fromall mentioned species. The profiles of the absorption bands inCdSe:Cr2+ and CdSe0.6S0.4:Cr2+ calculated on the basis of the numerical solution of the dynamical vibronic problems proveto be in quite good agreement with the experimental data.
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