New evidence of light-induced structural changes detected in As–S glasses by photon energy dependent Raman spectroscopy

Abstract Light-induced structural changes of g-As 40 S 60 and g-As 45 S 55 were probed by macro FT-Raman and photon-energy dependent micro-Raman spectroscopy. We hypothesize that some new observed features in the Raman spectra of these glasses are related to transformations of As 4 S 4 molecules possible through the m-As 4 S 4 intermediate. At the same time, other processes, connected mainly with the layers, composed of pyramidal AsS 3 structural units, take place. These new observed Raman modes and their possible interconnection to changes of the glassy structure are discussed.