ODMR of self-trapped excitons in mixed crystals AgBr x Cl 1- x (\(0{}x{}0.53\)) has been studied. With the increase of x , excitons become trapped at Ag sites having increasing numbers of Br ions in their coordination shells. For \(0.3{}x{}0.53\), excitons seem to be characterized as (AgBr 6 ) 5- complexes. These observations are explained by tunneling of excitons to energetically lower sites. Tunneling is, also, capable of explaining the abrupt change of the self-trapped state to the free state of excitons around x ∼0.55 reported by Kanzaki et al.
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Yamaga et al. (1983) studied this question.
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