Optical absorption, thermoluminescence (TL) glow and emission studies on rubidium chloride

Single crystals of suprapure RbCl after irradiation and subsequent F-light bleaching show an absorption band on the low energy side of F-band and enhancement of F-excited states, suggesting the formation of FA(K) centres (in the "Suprapure" labelled material about 100 ppm of potassium is present). TL of such irradiated samples show four glow peaks. Upon F-light bleaching a new glow peak appears on the low temperature side. The glow peaks corresponding to FA(K) centres have been identified. The spectral distribution of TL emission under different glow peaks has been studied. It is found that all the glow peaks have broad emission bands around 1.5, 2.5 and 2.8 eV. However, the high temperature peak shows additional emission around 2.1 and 3.9 eV. An attempt is made to interpret these emission bands in terms of recombination processes involving F and V type centres in these irradiated crystals. A tentative energy level diagram indicating various TL processes is also suggested. © 1981.