The binding geometry and equilibrium adsorption thermodynamics of CO chemisorbed on Cu(311) have been studied by angle resolved photoemission spectroscopy employing Heii (40.8 eV) radiation. Under saturation conditions, three distinct CO orientations are found; two of these are with the molecular axis nearly perpendicular to either the (100) or (111) microsurface. A third geometry, characterized by a lower heat of adsorption with complex coverage dependence, is seen in which the molecule lies flat on the (311) surface, parallel to the step direction. Local chemisorption sites are proposed and their significance in catalytic processes is considered.
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Shinn et al. (1981) studied this question.
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