Abstract
The absorption, emission and its excitation spectra of Ag - centers in NaCl, NaBr and RbCl crystals were investigated at various temperatures. Most of the properties of these centers were found to be qualitatively similar to those of potassium halides, except that NaBr does not show C emission. The third moment of the C band shape function was obtained as a function of temperature for KCl and RbCl, and was compared favorably with the Nasu-kojima theory. It is concluded that the linear electron-lattice coupling approximation is quite satisfactory for Ag - centers in various substances so far studied.
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