Abstract
Silver K-edge EXAFS measurements have shown that the photodissolved silver site in arsenic sulphide films is very similar to that in the bulk ternary glasses of the general composition Ag x (As 2S 3)( 1−x). Neither the films nor the glasses show a marked resemblance to any of the simple crystalline sulphides. In particular silver is 3-fold coordinated to sulphur without any pronounced AgAg or AgAs correlations. In those cases where a surfeit of silver has been added the EXAFS of the photodoped films exhibit a second neighbour peak which is interpreted as an incomplete dissolution of silver.
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