We have investigated the effect of co-absorbed CO and reaction temperature on the angular distribution of N2 desorption by N2O decomposition under the steady state of N2O–CO reaction on Rh(110). Spatial distributions of desorbing product N2 emission have been measured at various surface temperatures and CO coverages. The decomposed N2 collimates at 48°–61° off normal in the parallel plane to [001] and [110] directions, indicating that adsorbed N2O just before the decomposition is oriented along the [001] direction. Although the inclined and collimated N2 desorption is always observed at any steady-state CO coverage and reaction temperature, the shape of the collimated N2 distribution varied dependent on the co-adsorbed CO coverage. The distribution becomes sharp and shifts toward the surface normal direction with increasing CO coverage. These effects of adsorbed CO on the angular distribution of N2 are interpreted by the collision of desorbed N2 with co-adsorbed CO.

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