Abstract
Optically detected magnetic resonance in $a$-${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$ has shown that the emission consists of a high-energy triplet exciton recombination overlapping a low-energy pair process. The results are consistent with recombination at axial defects such as (${D}^{+}, {D}^{\ensuremath{-}}$) intimate valence-alternation pairs.
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