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The decay channels of cation excitons in alkali halide crystals are discussed. The excitation spectra of intrinsic and impurity emissions have been measured, using synchrotron radiation of 6–36eV, for NaCl, NaBr and NaI crystals at 8K and room temperature. Photons of 32eV form three, four and five electron–hole pairs each in NaCl, NaBr and NaI, respectively. An anion exciton is created instead of...
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