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Optically detected magnetic resonance experiments have been used to study the broad emission bands from iodine transported mixed crystals of ZnS x Se 1-x for x=0.85, 0.40, 0.10 and 0.00, for which donor to acceptor recombination involving A-centres is found to occur. The different self-activated emission bands are attributed to A-centres involving different configurations of neighbouring sulphur or selenium ions. The highest-energy band results from recombination at a (V Zn S 3 ) A-centre whilst recombination at A-centres in which the zinc vacancy has selenium neighbours results in emissions at lower energies.
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Nicholls et al. (1985) studied this question.
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