On dissociative mechanism of radiation defect-formation processes in alkali halide crystals

Possibility of realization of dissociative mechanism (DM) of radiation defect formation in alkali halide crystals (AHC) is considered. The DM suggests a nonuniform energy distribution between components of a molecular X2 (X=halide) ion in the process of radiationless annihilation of autolocalized exciton [X2-2+e]. Such nonuniform distribution (up to 80% on X0) may result in the halide interstitial atom displacement to a large distance from the decay point, i.e. to the formation of a well separated stable F-H-pair. Analysis of the F-H-pair annihilation kinetics in direct I- excitation in KBr-I by ArF laser light and in excitation of pure KBr by pulses of electrons or KrF-laser confirms realization of the Frenkel defect formation DM in AHC