2024-03-29T10:04:00Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/148862022-11-17T02:08:08Zhdl_2115_20059hdl_2115_151The collimation angle shift of desorbing product N₂in a steady-state N₂O+CO reaction on Rh(110)Matsushima, TatsuoNakagoe, OsamuShobatake, KosukeKokalj, Anton431The angular distribution of desorbing product N₂ was studied in N₂O decompositions on Rh(110) in the temperature range of 60–700 K. The N₂ desorption collimates along 62°–68° off normal toward either the [001] or [001¯] direction in a transient N₂O decomposition below ca. 470 K or in the steady-state N₂O+CO reaction above 540 K. In the steady-state reaction at the temperature from ca. 470 to 540 K, however, the collimation angle shifts from 62° to 45° with decreasing surface temperature. This angle shift is ascribed to the steric hindrance by coadsorbed CO because the N₂ collimation in transient N₂O decomposition at around 65° is recovered in the range of 380–500 K by an abrupt CO pressure drop followed by the decrease in CO coverage. N₂O is oriented along the [001] direction before dissociation. A scattering model of the nascent N₂ by adsorbed CO is proposed, yielding smaller collimation angles. ©2006 American Institute of PhysicsAmerican Institute of PhysicsJournal Articleapplication/pdfhttp://hdl.handle.net/2115/14886https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/14886/1/JCP125-133402.pdf0021-9606The Journal of Chemical Physics125131334022006-10-07enginfo:pmid/17029476info:doi/10.1063/1.2352744Copyright © 2006 American Institute of Physicspublisher