A thin film of arsenic trioxide was compressed between two alkali halide discs and heated up to 15o°C for 12 hours. Several modifications, which are stronger going from KCl to KBr to KI and depend on the activation of alkali halide and on water vapour absorbed, are observed in the i.r. spectra of the thin film. They are attributed to surface interaction between the film and the alkali halide discs and emphasize the change of the film structure from "arsenolite" towards a "claudetite" type structure in which arsenic atoms interact with halogen atoms. Raman Laser spectra on the arsenic trioxide-alkali halide-water mixtures confirm the phenomenon, showing the importance of water presence. An interpretation of the reaction proceeding from the theory of electronic surface states is given at the end.
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Con il contributo del Ministero per i Beni e le Attività Culturali