The photodarkening effect in evaporated As2S3 films has been studied. Optical transmissivity was measured and its dependence on intensity, wavelength, temperature and previous thermal history was found. A structural investigation was also made using Raman spectroscopy. A feature at 231 cm−1 in the Raman spectra, which is associated with homopolar As–As bonds, is enhanced after photodarkening. A model based on the redistribution of chemical bonds under illumination is used to explain the results.
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Frumar et al. (1984) studied this question.
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