Modifying the adsorption characteristics of water on Ru{0001} with preadsorbed oxygen

Autor:	A. A. El-Zein, M. J. Gladys, Georg Held, J. N. Anderson, Anders Mikkelsen
Rok vydání:	2008
Předmět:	Low oxygen Hydrogen bond chemistry.chemical_element Condensed Matter Physics Photochemistry Oxygen Dissociation (chemistry) Electronic Optical and Magnetic Materials Adsorption High oxygen X-ray photoelectron spectroscopy chemistry Atomic physics Self-ionization of water
Zdroj:	Physical Review B. 78
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.78.035409
Popis:	The coadsorption of water and preadsorbed oxygen on Ru{0001) was studied by synchrotron-based high-resolution x-ray photoelectron spectroscopy. A dramatic change was observed in the interaction of water with oxygen between low and high oxygen precoverages. Low oxygen coverages below 0.18 ML induce partial dissociation, which leads to an adsorbed layer of H2O and OH. Around half the oxygen atoms take part in this reaction. All OH recombines upon heating to 200 K and desorbs together with H2O. Oxygen coverages between 0.20 and 0.50 ML inhibit dissociation, instead a highly stable intact water species is observed, which desorbs at 220 K. This species is significantly more stable than intact water on the clean surface. The stabilization is most likely due to the formation of hydrogen bonds with neighboring oxygen atoms. For intermediate oxygen coverages around 0.18 ML, the dissociation behavior depends on the preparation conditions, which points toward possible mechanisms and pathways for partial dissociation of water on Ru{0001}.
Databáze:	OpenAIRE
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