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Articles you may be interested inAngular and energy distributions of D 2 molecules desorbing from sulfur and oxygen modified V(111) surfaces Chemical and spectroscopic surface science investigation of MoO 3 and MoO 3 /Al 2 O 3 ultrathin films J. Vac. Sci. Technol. A 15, 1717 (1997); 10.1116/1.580926 Adsorption state of hydrogen sulfide on the GaAs (001)-(4×2) surface J.The reactivity of 1,2-ethanedithiol on the clean Mo ͑110͒ and p(4ϫ4)-C/Mo ͑110͒ surfaces has been investigated as a function of sulfur coverage using temperature programmed desorption ͑TPD͒, Auger electron spectroscopy, and low energy electron diffraction. TPD experiments performed on both surfaces produced similar reaction products, although changes were observed in selectivity. On the clean Mo ͑110͒ surface, the major products observed during TPD experiments were acetylene, ethylene, vinyl thiol, and ethanethiol. However, the reaction of ethanedithiol on the p(4 ϫ4)-C/Mo ͑110͒ surface produced acetylene, ethylene, and ethanedithiol. Product molecules are thought to arise from two distinct types of surface intermediates: ͑1͒ a monodentate thiolate species bound to the surface through only one of the ethanedithiol sulfur atoms, and ͑2͒ a bidentate organosulfur metallocycle bound to the surface through both of the ethanedithiol sulfur atoms. We propose that vinyl thiol and ethanethiol are produced via C-S bond scission and subsequent hydride elimination of the monodentate thiolate intermediate, and that the bidentate surface metallocycles undergo C-S bond scission to yield acetylene and ethylene. On the carbon-modified surface, complete desulfurization of ethanedithiol occurs upon decomposition, yielding only hydrocarbon products. With increasing sulfur coverage, a decrease in reactivity and a shift in desorption features to lower temperatures is observed for ethanedithiol on the clean and carbon-modified surfaces.

Articles you may be interested inPt metal-CeO 2 interaction: Direct observation of redox coupling between Pt 0 / Pt 2 + / Pt 4 + and Ce 4 + / Ce 3 + states in Ce 0.98 Pt 0.02 O 2 − δ catalyst by a combined electrochemical and x-ray photoelectron spectroscopy study Stability of cerium oxide on silicon studied by x-ray photoelectron spectroscopy

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