Field‐ion and emission microscopy techniques were used to study the adsorption and desorption of carbon monoxide on (101̄1), (101̄0), (112̄2), and (202̄1) regions of ruthenium. Both physisorbed CO and β‐CO were found on all regions, while α‐CO was found only on low‐index (101̄1) and (101̄0) regions. Substrate and/or adsorbate rearrangements also occurred on all regions. While the M–CO bond energy was found to be less on ruthenium than that reported for tungsten, the ratio of the M–CO to MM bond energy was found to be greater in the case of ruthenium.

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