Abstract
The angular and velocity distributions of desorbing product CO2 were studied in steady-state CO oxidation on Rh(110) by means of cross-correlation time-of-flight techniques and low-energy electron diffraction. In the limited CO pressure range in the active region, where the reaction was fairly first order in CO, the angular distribution in the plane including the [001] direction abruptly changed from a normally directed form into bidirectional lobes collimated at ±24° from the surface normal. At the same time, the CO2 productivity was enhanced, and the (1 × 2) LEED pattern due to the missing-row structure was observed. The translational temperature of desorbing CO2 was maximized at these collimation angles. The metastable (1 × 2) missing-row structure was proposed to be responsible for this CO2 formation. However, in the inhibited region, where CO retarded the reaction, desorbing CO2 was thermalized to the surface temperature.
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