Abstract
The adsorption of NO and CO on Cu(100) and Cu(210) at 110 K and the subsequent desorption/reaction have been studied by static SIMS, and complemented by XPS. After NO and CO coadsorption at 110 K, the major adsorbates are found to be NO 2, N 2O 4, NO, NO 3, CO, N and O adatoms. The dissociative adsorption of NO to form N and O adatoms is strongly enhanced on the stepped Cu(210) surface. Most of the molecular species desorb by 200 K upon heating the adlayer. On the stepped surface only, the formation of the isocyanate (-NCO) intermediate is observed, and is deduced to form via the reaction of adsorbed CO and N adatoms at step sites. At higher temperatures (200–300 K) the isocyanate intermediate decomposes to a cyanide (-CN) species.
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