Abstract
Unexpected structural and dynamical features of non-crystalline As 2O 3, revealed through various light scattering techniques, indicate that this glass is distinctively different form other common oxide glasses. In view of its structural similarity with other chalcogenide glasses, i.e. As 2S 3 and As 2Se 3, it is suggested that the peculiar spectral properties of As 2O 3 may originate from structural configurations like those usually employed to account for photoinduced phenomena in chalcogenide glasses. The lone-pair electrons of oxygen atoms and the structural flexibility characterizing As 2O 3 compared to other tetrahedrally coordinated oxide glasses seems to be the key factor for the observed unique properties of this glass.
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