Abstract
The peak positions and half-widths of cadmium bands in cesium and rubidium halides are reported. In cesium halides three bands are observed in the region (240 ÷ 300) nm, while in rubidium halides no such bands are observed. Two new bands were obtained in some of these crystals where irradiation was possible and are similar to theD1 andD2 bands. In additively or electrolytically coloured crystals an intense broad band was observed in the UV region in all these crystals besides theF-band and in crystals quenched from high temperatures (about 600 °C) we observe only the UV band. The intensity of this band is a function of the cadmium content. Associated with this UV band is also a broad Lorentzian EPR line. The UV band obtained after thermally quenching from 600 °C is ascribed to the cadmium colloids. No aggregateM-like centres are observed on optical bleaching of theF-band. The values ofWs,Ec andWa in the case of RbCl : Cd have been obtained from electrical-conductivity measurements as 1.40, 0.9 and 0.62 eV respectively. The dielectric-loss measurements in cadmium-doped cesium iodide give a bound-vacancy migration, energy ∼ 0.58 eV.
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