Free and trapped electrons, self-trapped holes AgCl₆^_^-4, and self-trapped excitons exist simultaneously in band-gap-irradiated AgCl at low temperatures and contribute to the AgCl luminescence. Small amounts of bromide impurity in AgCl promote the formation of a self-trapped exciton containing bromide which also radiates. The various centers are investigated through the luminescence, optically detected magnetic resonance, and level-anticrossing spectra of neat and bromide-doped AgCl.
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Marchetti et al. (1981) studied this question.
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