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• W2094239684 endingPage "4333" @default.
• W2094239684 startingPage "4313" @default.
• W2094239684 abstract "The optical absorption spectra of substitutional ${mathrm{Cr}}^{2+}$ ($3{d}^{4}$) in single crystals of ZnS (cubic and mixed cubic-and-hexagonal), ZnSe, ZnTe, CdS, and CdTe have been measured for Cr concentrations of ${10}^{18}$-${10}^{20}$ ${mathrm{cm}}^{ensuremath{-}3}$ and at 2, 15, and 300ifmmode^circelsetextdegreefi{}K in the wave-number range $5ensuremath{le}overline{ensuremath{nu}}ensuremath{le}30000$ ${mathrm{cm}}^{ensuremath{-}1}$. The room-temperature spectrum in the range $500ensuremath{le}overline{ensuremath{nu}}ensuremath{le}30000$ ${mathrm{cm}}^{ensuremath{-}1}$ is dominated by a broad absorption band at 5500 ${mathrm{cm}}^{ensuremath{-}1}$ arising from the $^{5}T_{2}ensuremath{rightarrow}^{5}E$ transition. These two levels originate from the crystal-field splitting of the $^{5}D$ free-ion ground state. At helium temperatures distinct lines appear on the low-energy side of the $^{5}T_{2}ensuremath{rightarrow}^{5}E_{2}$ absorption band in all samples except for CdTe. These lines are associated with zero-phonon transitions and phonon-assisted transitions. As the temperature is increased, the relative intensities of some of the lines change due to the thermal population of low-lying levels belonging to the orbital ${T}_{2}$ state. In the case of ZnSe these levels have been studied in the far infrared in the range $5ensuremath{le}overline{ensuremath{nu}}ensuremath{le}200$ ${mathrm{cm}}^{ensuremath{-}1}$, both with and without a magnetic field. An interpretation of the results is made based on crystal-field theory with a strong, static, Jahn-Teller distortion of $E$ symmetry in the $^{5}T_{2}$ orbital ground state. There is little or no Jahn-Teller effect in the $^{5}E$ orbital excited state. The optical transitions exhibit a strong coupling to $E$-mode phonons of average energy ensuremath{sim}70 ${mathrm{cm}}^{ensuremath{-}1}$." @default.
• W2094239684 created "2016-06-24" @default.
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• W2094239684 date "1970-12-01" @default.
• W2094239684 modified "2023-09-26" @default.
• W2094239684 title "Infrared Absorption in Some II-VI Compounds Doped with Cr" @default.
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• W2094239684 doi "https://doi.org/10.1103/physrevb.2.4313" @default.
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