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dc.contributor.authorKulkarni, G U-
dc.contributor.authorRao, C N R-
dc.contributor.authorRoberts, M W-
dc.identifier.citationJournal of Physical Chemistry 99(10), 3310-3316 (1995)en_US
dc.descriptionRestricted Accessen_US
dc.description.abstractAdsorption of dioxygen at clean Ni(110) and Ni(100) surfaces gives rise to two prominent features in the O(1s) spectra at 530 and 531 eV due to O2- and O- type species, respectively. Interaction of ammonia with a Ni(100)-O surface where theta(oxygen) < 0.1 ML favors the dissociation of NH3 giving NHn, (n = 1, 2) and N(a) species. This is accompanied by a decrease in the intensity of the 531 eV feature. On the other hand. a Ni(100)-O surface where the oxygen species are mainly of the O2- type is unreactive, Coadsorption studies of NH3-O-2 mixtures show that at Ni(110) surfaces the uptake of both oxygen and ammonia increase with the proportion of oxygen in the NH3-O-2 mixture. The surface concentrations of the O- species and the NHn species also increase with the increase in the O-2/NH3 ratio while the slope of the plot of sigma(N) versus sigma(O-) is around unity. The results demonstrate the high surface reactivity of the O- species and its role in the dissociation of ammonia. Based on these observations, the possibility of the formation of a surface complex between ammonia and oxygen (specifically O-) is suggested. Results from vibrational spectroscopic studies of the coadsorption of NH3-O-2 mixtures are consistent with those from core-level spectroscopic studies.en_US
dc.publisherAmerican Chemical Societyen_US
dc.rights© 1995 American Chemical Societyen_US
dc.titleNature of the Oxygen Species at Ni(110) and Ni(100) Surfaces Revealed by Exposure to Oxygen and Oxygen-Ammonia Mixtures : Evidence for the Surface Reactivity of O- Type Speciesen_US
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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