The spatial distribution of defects produced in alkali halides by electron irradiation

Abstract
Irradiation of alkali halides “with 30 kv electrons produces coloration, sputtering and polygonization of the surface. Bleaching and annealing studies show that there are several types of F centre which give characteristic F bands. It suggested that movement of anion vacancies results in the development of polygonization lines. The results are interpreted in terms of a model where the different types of F centre are not uniformly distributed throughout the crystal and the first stage (fast colouring) centres are concentrated around the dislocations.