Water dissociation on Ru(001): An activated process

It is shown using x-ray photoelectron spectroscopy that water is adsorbed either nondissociatively or partially dissociatively on Ru(001) under ultrahigh vacuum conditions. We found an activated dissociation process with a barrier slightly larger than that of desorption. A difference in dissociation...

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Bibliographic Details
Published in:Physical review letters 2004-11, Vol.93 (19), p.196101.1-196101.4, Article 196101
Main Authors: ANDERSSON, K, NIKITIN, A, PETTERSSON, L. G. M, NILSSON, A, OGASAWARA, H
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physics
Solid surfaces and solid-solid interfaces
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:It is shown using x-ray photoelectron spectroscopy that water is adsorbed either nondissociatively or partially dissociatively on Ru(001) under ultrahigh vacuum conditions. We found an activated dissociation process with a barrier slightly larger than that of desorption. A difference in dissociation barriers is found between H2O and D2O that explains the anomalous isotope effects in the thermal desorption. Previous theoretical and experimental disagreements can be rationalized based on electron or x-ray beam-induced dissociation of the water overlayer and an earlier underestimation of the dissociation barrier.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.93.196101