Abstract
In chromium-doped AgCl crystals, the conversion from Cr 2+ ions to Cr 3+ ions by illumination with blue light below 178 K has been detected by means of EPR. Three kinds of spectra could be identified. The angular dependence of the EPR signals and the temperature dependence of signal intensities indicate two [100]-axial centers of the point groups C 4v and D 4h, and an orthorhombic center of the point group D 2h. The centers are interpreted as Cr 3+ ions associated with one or two Ag + vacancies. At temperatures above 178 K, the recharging to Cr 2+ takes place. The interaction between Cr 3+ and vacancies is estimated. The mechanism of charge transfer between Cr 2+ and Cr 3+ is discussed.
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