Abstract
The near edge X-ray absorption fine structure at the oxygen K edge has been used to determine the orientation of adsorbed carbon monoxide at both step and terrace sites at 80 K on the stepped Pt(533) surface. The angular dependence of both the 2 π intensity and the σ/2π intensity ratio indicates that the terrace CO is bonded essentially normal to the terrace and that the step CO is tilted away by only a few degrees towards the macroscopic surface normal. A dramatically large angle of tilt for step CO, as observed in other systems, was not found. The energy of the σ -resonance is identical for both step and terrace CO indicating that there is little change in the C−O bond order even though temperature programmed desorption shows that the step species is more strongly bound by ∼20 kJ mol −1 (∼0.2 eV molecule −1 ).
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