Abstract
The growth of the F band under X-irradiation has been studied in KCl whiskers of various purities. Darkening occurs in two stages as in ordinary crystals. Stage 1 is, however, much greater in whiskers, showing that they contain a large initial concentration of vacancies or vacancy clusters. A reason for this behaviour is briefly outlined, based on the observed dislocation pattern in the whiskers. Though the measured dislocation content of the whiskers is an order of magnitude smaller than in ordinary (Harshaw) crystals no significant differences in stage 2 coloration have been found to support a dislocation mechanism of vacancy production. The d.c. conductivity of whiskers has also been studied as a function of temperature. The results show that whiskers have a remarkable degree of purity.
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