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In addition to the previously reported paramagnetic hole center localized on the chalcogen, a conjugate optically induced electron center localized on an As atom is observed in glassy As₂{S}₃$ and ${As}₂Se₃. The chalcogen center is further identified as a hole localized in a nonbonding p orbital. These optically induced centers are unique to the amorphous phase, and their density saturates at or below 10¹⁷ spins/cm³.
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Bishop et al. (1976) studied this question.
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