Abstract
In the light of a recent theoretical study claiming partial dissociation of water on Ru(0 0 1) [Science 295 (2002) 99], the adsorption of the first layers of H 2O and D 2O on Ru(0 0 1) is investigated using an especially sensitive temperature programmed desorption technique. Hydrogen desorption following thermal desorption of molecular water is used to analyze the amount of atomic hydrogen (H or D) remaining on the ruthenium surface as a function of initial H 2O or D 2O coverage, respectively. For both water isotopomeres atomic hydrogen is observed to remain on the surface after water desorption, indicating that dissociative adsorption is taking place at least to a small extent for both H 2O and D 2O. In the framework of the proposed half-dissociated water structure by Feibelman, the H 2:D 2 ratio of ∼26 for the maximum hydrogen yield might be a consequence of an isotope effect in the recombinative desorption of water due to the different adsorption superstructures for H 2O and D 2O as reported by Held and Menzel [Phys. Rev. Lett. 74 (1995) 4221].
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
