Abstract
Angle-resolved photoemission spectroscopy with synchrotron radiation has been used to study the adsorption of CO on a NbC(111) surface at 80 K. CO is adsorbed molecularly on the NbC(111) surface. Binding energies of the CO valence levels are in good agreement with previously published results for metal–CO systems. The adsorbed CO forms a (1×1) overlayer. The two-dimensional band dispersions of CO valence levels in the (1×1) phase are measured in the Γ̄M̄ direction. The considerable dispersions (∼0.35 eV for both 4σ and 5σ+1π levels) are observed as in the case for the periodic CO layer on the metal surfaces. A shape resonance of the 4σ level of the adsorbed CO is observed at ∼32 eV, which is nearly the same energy as that for the gas phase CO. The 4σ cross section at the resonance energy is measured as a function of incidence angles and the result is consistent with a molecular orientation normal to the surface.
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