Abstract
Abstract The isotopomers 14 N 16 O and 15 N 18 O were used to obtain information on the mechanisms of NO reaction on silver layers on Ru(001), by observation of the isotopic distributions of the products. NO adsorption on Ag in the 75–100 K range produces adsorbed N 2 O and oxygen atoms. Very different isotopic distributions of product N 2 O are observed, depending on whether the NO isotopomers are dosed simultaneously or sequentially. The observed N 2 O distributions favor a non-dissociative reaction pathway with a NO dimer as the reaction intermediate. The isotopic distribution of a high temperature NO desorption state can be explained by dissociation of a NO 2 surface species that is formed at a low temperature. The N 2 O which is produced by reaction of NO on the surface is found to have a higher desorption temperature than N 2 O adsorbed on either the clean Ag surface or on an oxygenated Ag surface. This is attributed to a strong binding interaction with surface NO 2 .
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