Abstract
We report a high-resolution electron energy spectroscopy (HREELS) study of the coverage dependence of the RuCO and CO stretch modes of chemisorbed CO on Ru(0001) at 300 K. For CO coverages θ CO larger than 0.33 we observe remarkable frequency changes. Up to θ CO=0.33 both frequencies increase due to lateral dipole coupling. For θ CO>0.33, i.e. in the compression pha ν(CO) increases even stronger whereas ν(RuCO) decreases. The decrease of ν(RuCO) gives direct evidence of the weakening o the bond between CO and the surface which correlates with the known thermal desorption and structural data.
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