Abstract
Effect of uv-light irradiation on iodine impurities in KCl: I crystal has been investigated. By uv-light irradiation, intensities of absorption and emission bands associated with isolated iodine ions (monomers) diminish, whereas UV emission band at 4.64 eV due to paired iodine ions (dimers) is enhanced. Enhancement of the UV emission band was confirmed also by measuring excitation spectra. These results suggest that uv-light irradiation converts monomers into dimers. Linear dependence of the growth rate of the UV emission band on the concentration of iodine was confirmed experimentally. This ensures that the probability of trapping for moving monomers is proportional to the concentration of iodine. Therefore, it is certain that the iodine ions excited with uv-light move through the lattice of the host crystal.
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