Abstract
Abstract Angle-resolved photoemission with a synchrotron source has been used to study in detail the valence electronic properties of CO and N 2 chemisorbed on the Ru(001) surface. CO/Ru(001) was investigated in two distinct coverage regimes corresponding to ( 3 × 3 ) R 30° and (2 3 × 2 3 ) R 30° ordered phases. N 2 was studied in the ( 3 × 3 ) R 30° phase. Binding energies of the CO valence levels are in good agreement with previously published results. The shape resonance positions of the 5σ and 4σ levels were measured and were found at ∼ 28 and 37 eV, respectively, and are discussed in detail in comparison with results of other systems. The CO bandwidths were measured and correlate well with measurements on other systems. The bandwidth of the N 2 5σ valence level was found to be substantially smaller than that of CO. An explanation is offered in terms of multi-electronic excitations associated with the N 2 levels. In all cases, our results are consistent with a perpendicular orientation of the CO and N 2 molecules.
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