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 SM ISO690:2012KLOKISHNER, Sophia I., REU, Oleg, OSTROVSKY, Sergei M., PALII, Andrew, TOWE, Elias. A vibronic model for the absorption spectra of Cr2+ ions in CdSexS1-x. In: Journal of Physics Condensed Matter, 2007, vol. 19, pp. 1-23. ISSN 0953-8984. DOI: https://doi.org/10.1088/0953-8984/19/48/486213 |
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  Journal of Physics Condensed Matter |
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| Volumul 19 / 2007 / ISSN 0953-8984 /ISSNe 1361-648X | ||||||
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| DOI:https://doi.org/10.1088/0953-8984/19/48/486213 | ||||||
| Pag. 1-23 | ||||||
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In the present paper we report a vibronic model for the absorption bands of the Cr2+ ion in CdSe 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 of the 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 the CrSe4, CrSe3S, CrSeS3 and CrSe2S2 species are determined and the profiles of the absorption bands corresponding to these species are calculated. The total spectrum of the CdSe0.6S0.4:Cr 2+ crystal is obtained by summation over partial spectra arising from all mentioned species. The profiles of the absorption bands in CdSe:Cr 2+ and CdSe0.6S0.4:Cr2+ calculated on the basis of the numerical solution of the dynamical vibronic problems prove to be in quite good agreement with the experimental data. |
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| Cuvinte-cheie Engineering controlled terms Absorption spectra, Cadmium compounds, Charge transfer, Chromium compounds, Crystals, Numerical methods Engineering uncontrolled terms Dynamical vibronics, Vibronic models Engineering main heading Positive ions |
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