Spatial Distribution of Trapped Electrons and Holes Produced by X Rays in KI(TlI)

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Abstract
When KI(TlI) is irradiated at 78°K, trapped electrons and holes are produced. Warming mobilizes the holes which either recombine to give light or are trapped to give new absorptions. Light sum and absorption measurements show that the ratio of retrapping to recombination (Rh) for holes is independent of the concentration of electron and hole centers. Bleaching in the ir frees trapped electrons which either recombine giving light or are retrapped. The relative quantum efficiency, which is a measure of the ratio of retrapping to recombination (Re) for electrons, is independent of the concentration of electron and hole centers. The stimulated electron recombination kinetics are first order with respect to concentration. From these facts it is suggested that the electron and hole are trapped near each other as a pair.