Abstract
Luminescence spectra have been photographed at various temperatures down to 4°K in KBr, KCl and NaCl crystals. Two ultra violet emission bands are found. The higher energy band is strong at 4°K and decreases its intensity with temperature and vanishes at 60°K. The intensity of the lower energy band is weak at 4°K but increases with temperature until 80°K. It is inferred that the higher energy band is attributed to the electron recombination with hole in H center and the lower energy band is emitted by the annihilation of a trapped exciton which is temporarily generated from the electron capturing by a self trapped hole of V K center. Four emission bands are found at visible region in KCl crystal at 4°K which seem to construct a hydrogenic series.
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