Abstract
The adsorption of H 2S on clean and partially sulfided Au(110) surface has been investigated via temperature-programmed desorption. H 2S adsorbs with unit sticking probability on the clean surface at 105 K up to completion of the monolayer. Adsorption is almost entirely molecular: when a monolayer of H 2S is adsorbed onto a clean Au(110) surface in the absence of incident electrons only about 2% of a monolayer of sulfur remains after desorption of H 2S. H 2S desorbs from molecular adsorption states at 130 K, 155 K, 180–200 K and 220 K. Adsorbed H 2S is extremely sensitive to electron irradiation and decomposes to adsorbed SH groups and adsorbed hydrogen. Recombinative desorption of H 2 occurs at about 215 K, while the adsorbed SH groups disproportionate above about 270 K to form gaseous H 2S and adsorbed sulfur. On partially sulfided surfaces H 2S still adsorbs with unit sticking probability. Adsorbed H 2S reacts with adsorbed sulfur to form adsorbed SH groups which again disproportionate above 270 K.
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