Temperature programming of NO and C2H4 coadsorbed on Rh(111) gives ris
e to the desorption of a number of gases. Where H-2, H2O, CO2 and N-2
are the main products at low C2H4 coverages, significant amounts of HC
N, CO and NO evolve at higher C2H4 coverages. Static SIMS indicates th
e formation of a large supply of adsorbed CN species, part of which de
sorbs as HCN, while the remainder decomposes and is responsible for de
layed formation of N-2. For the highest C2H4 coverages the majority of
the initially adsorbed NO desorbs as HCN.