title: Effect of co-adsorbed CO and reaction temperature on the dynamics of N2 desorption under steady-state N2O-CO reaction on Rh(110).
abstract: We have investigated the effect of co-absorbed CO and reaction temperature on the angular distribution of N(2) desorption by N(2)O decomposition under the steady state of N(2)O-CO reaction on Rh(110). Spatial distributions of desorbing product N(2) emission have been measured at various surface temperatures and CO coverages. The decomposed N(2) collimates at 48°-61° off normal in the parallel plane to [001] and [110] directions, indicating that adsorbed N(2)O just before the decomposition is oriented along the [001] direction. Although the inclined and collimated N(2) desorption is always observed at any steady-state CO coverage and reaction temperature, the shape of the collimated N(2) 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 N(2) are interpreted by the collision of desorbed N(2) with co-adsorbed CO.
authors.affiliation: Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1,Tsukuba, Ibaraki 305-8573, Japan.
authors.forename: Masataka
authors.initials: M
authors.lastname: Sakurai
authors.forename: Takahiro
authors.initials: T
authors.lastname: Kondo
authors.forename: Junji
authors.initials: J
authors.lastname: Nakamura