Abstract
Measurements have been made of the low-temperature luminescence and Raman spectra of pure Cs/sub 2/PtF/sub 6/ crystals and Cs/sub 2/PtF/sub 6/-Cs/sub 2/GeF/sub 6/ crystals in which PtF/sub 6//sup 2 -/ is doped into the Cs/sub 2/SiF/sub 6/ lattice. In both environments, the Raman spectra at liquid-helium temperature show sharp lines assigned to the a/sub 1g/, e/sub g/, and t/sub 2g/ internal modes of the PtF/sub 6//sup 2 -/ ion. A comparison of the low-temperature Raman and sharp-line luminescence spectra indicates that in the luminescence spectra a Jahn-Teller e/sub g/-type progression occurs with a small degree of anharmonicity present. The luminescence can be assigned as a transition from the t/sub 2//sup 5/e/sub g/GAMMA/sub 3/(/sup 3/T/sub 1g/) twofold degenerate excited electronic state to the t/sub 2g//sup 6/GAMMA/sub 1/(/sup 1/A/sub 1g/) nondegenerate ground electronic state.
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