Abstract
A novel analysis of optical absorption tails of inorganic network glasses is shown to provide important information on the structure of the glass. The anomalous composition and temperature dependence of absorption tails in Ge x Se 1− x and As x Se 1− x systems indicate that these glasses retain locally layered structures at particular stoichiometries corresponding to GeSe 2 and As 2Se 3, and a reversible structural change is taking place well below the glass transition temperature. A phenomenological model for the absorption tail slope of glasses is proposed, analogous to the Urbach rule for crystalline materials.
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