First stage F-centre production in irradiated alkali halides

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Abstract
Kinetic equations describing the formation of F-centres during irradiation of alkali halides doped with divalent cation impurities have been developed. These incorporate the stabilization of H-centres and di-interstitial halogens at impurity-vacancy dipoles or dipole aggregates as well as radiation-induced interstitial detrapping processes. Numerical and approximate analytical solutions of the equations show the first stage of F-centre growth to be a dynamic, temperature-dependent process in agreement with experiment. They also provide a new explanation of the experimentally observed relation between the first stage F-centre concentration and the square root of the divalent cation impurity concentration

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