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The 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 Physic

The collimation angle shift of desorbing product N2 in a steady-state N2O+CO reaction on Rh(110)