Does chemisorbed carbon monoxide dissociate on rhodium?

Isotopic exchange measurements have shown that at surface temperatures below 800 K, the upper limit on the probability of dissociation/recombination of CO on Rh(111) is approximately 10 ^-3. Related Auger spectroscopic measurements, monitoring the accumulation of atomic carbon on the surface, have shown that the maximum probability of dissociation of CO per collision with the Rh surface in a temperature range between 300 and 870 K is 10 ^-4. Hence, it has been demonstrated that the probability of dissociation of CO on Rh(111) is negligible compared to the probability of molecular desorption, in contrast to recent reports in the literature concerning both polycrystalline Rh and stepped surfaces of Rh.