Abstract
Valence band photoemission has been used to investigate the surface configuration and thermal decomposition of acetylene and ethylene chemisorbed on the Co(0001) surface. Although acetylene chemisorbs on Co(0001) in a manner common to acetylene on many other transition metal surfaces, ethylene bonds to Co(0001) in a manner that causes it to decompose completely below room temperature. The saturated ethylene overlayer at low temperature is unusual since it contains enough vacant sites to allow the coadsorption of 25% of a monolayer of CO. Literature precedents are utilized to propose a bonding mode and decomposition mechanism consistent with this data.
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