Abstract
Reversible photostructural changes in a binary As2Se3 glass have been studied by high-precision in-situ EXAFS. We demonstrate that the coordination number of selenium species increases reversibly in the photoexcited state while the coordination number for arsenic species remains unchanged, which is attributable to the creation of dynamic Se-Se interlayer bonds. Photoexcitation increases disorder near selenium and arsenic species and gives rise to bond breaking which restores the initial coordination number of both constituents and creates “wrong” As-As and Se-Se bonds.
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