Kadmiyevyye tsyentry v galogyenidakh tsyeziya i r ubidiya

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 the D 1 and D 2 bands. In additively or electrolytically coloured crystals an intense broad band was observed in the UV region in all these crystals besides the F-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 aggregate M-like centres are observed on optical bleaching of the F-band. The values of W s, E c and W a 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. © 1973 Società Italiana di Fisica.