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Reactions between adsorbed atomic nitrogen and ethylene on Rh(111) have been investigated by temperature-programmed reaction spectroscopy (TPRS), secondary ion mass spectrometry (SIMS), and work function measurements. Coadsorption of a small amount of ethylene to 0.10 monolayer of atomic nitrogen results in the formation of a surface cyanide species, which is detected by SIMS through the Rh2CN+ cluster ion. Cyanide formation has been followed by measuring the decrease of the atomic nitrogen and carbon coverages and the accompanied increase in the CN coverage in temperature-programmed SIMS experiments. The CN formation kinetics is described by a preexponential factor and an activation energy of 1011±1 s-1 and 111 ± 10 kJ/mol, respectively. In the absence of surface hydrogen, CN groups are stable up to ∼700 K. CN decomposition results in reaction-limited desorption of N2 with a maximum at 800 K and is described by a preexponential factor and an activation energy of 1013±1 s-1 and 210 ± 15 kJ/mol. Coadsorpti...

C−N Coupling in Reactions between Atomic Nitrogen and Ethylene on Rh(111)