Abstract
The present paper reports the phenomenological theory of deformation bleaching of coloration in alkali halide crystals. Expressions are derived for the dislocation capture probability of F-centre electrons in alkali halide crystals, and for the rate of generation of electrons in the dislocation band. On the basis of the rate of generation of dislocation electrons and their subsequent recombination with hole centres, deep traps and other compatible traps (including deformation generated traps), an expression is derived for the deformation bleaching, which indicates the exponential decrease of the density of F-centres with deformation of the crystal. A good agreement is found between the theoretical and experimental results. The value of the effective radius re of the interaction of dislocations with F-centres, is estimated and it is found to be 1.95b, 2.00b, 1.33b and 1.70b for KCl, KBr, NaCl and NaBr crystals, respectively (where b is the Burgers vector).
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