Optical detection of EPR using recombination luminescence shows that the self-trapped exciton in AgCl is a (100) oriented complexes of the type (Cl-Ag-Cl) - . In AgCl doped with AgBr, excitons are also trapped at bromine sites forming (100) oriented complexes of the type (Cl-Ag-Br) - . These centres are produced either by X-ray or UV excitation. In very lightly doped crystals UV excitation is much more effective than X-rays in producing the bromine complex and the reasons for this are discussed.
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Hayes et al. (1978) studied this question.
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