Abstract
The interaction of nitric oxide with ruthenium (101̄0) has been studied using low-energy electron diffraction (LEED) and Auger electron spectroscopy (AES) techniques at substrate temperatures and reactant partial pressures as high as 950° C and 10 −6 Torr, respectively. Nitric oxide adsorption is rapid at temperatures below 200°C and results in the formation of c(2 × 4) and (2 × 1) ordered LEED structures at proposed coverages of 0.25 and 0.50 monolayers of dissociated adatoms. The nitrogen adatoms desorb if the sample temperature is raised above 200°C. Prolonged exposures at temperatures greater than 400°C result in the slow development of (7 × 1), c(4 × 8) or c(2 × 6) LEED structures depending upon the temperature and the fractional surface coverage of oxygen adatoms. A model involving the formation of non-stoichiometric surface oxide phases is proposed. The data are correlated with the results of earlier studies on the nitric oxide reduction reaction.
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