Adsorption and thermal evolution of S O2 on Ru(0001)

F. Hennies, A. Föhlisch, W. Wurth, P. Feulner, A. Fink, D. Menzel

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Using high resolution S 2p and O 1s x-ray photoelectron spectroscopies, the adsorption of S O2 and its surface bound reaction products on Ru(0001) have been investigated simultaneously while dosing S O2 and while heating the adsorbed species. S O2 is found to adsorb on Ru(0001) at 100 K molecularly in two variants as well as dissociatively and to react to S O3, S O4, SO, and S with increasing coverage. After the monolayer has been saturated, S O2 adsorbs molecularly in multilayers. When heating adsorbed S O2 from 100 K, SO, S O2, and S O4 decompose in a wide temperature range up to 305 K. In contrast SO3 is found to be stable bound to Ru(0001) up to 300 K and to disappear from the surface to below 325 K. At 550 K the surface remains with a saturated atomic sulfur and oxygen layer and some sulfur species in a second layer. Our quantitative analysis of the sulfur amount bound to the surface supports a simple desorption process only for S O4. All other species mainly or partly decompose on the surface.

Original languageEnglish
Article number154709
JournalJournal of Chemical Physics
Issue number15
StatePublished - 2007


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