Optically induced electron-spin resonance inAsxS1−x

Four different metastable paramagnetic centers have been identified in the low-temperature, light-induced electron-spin resonance (ESR) spectrum of glassy ${\mathrm{As}}_2$ ${\mathrm{S}}_3$. Two of the centers anneal at significantly lower temperatures than the other two, allowing the line shapes to be partially separated with isochronal annealing experiments. The two centers which anneal at lower temperatures, labeled type-I centers, constitute approximately 15% of the induced spins after long-time irradiation at high intensities (≥100 mW/${\mathrm{cm}}^2$).