Abstract
The adsorption of CO on the Co(0001) surface at room temperature and at 180 K has been studied using work function measurements, X-ray photoelectron spectroscopy, thermal desorption spectroscopy (TDS) and low energy electron diffraction. At low coverages and at room temperature the standard ( 3 × 3 ) R30°−CO structure was observed. By decreasing the temperature and increasing the CO exposure, other stable structures were found on the surface. The ( 7/3 × 7/3 ) R10.9°−CO structure was found in a small coverage range around θ=0.43 ML and the ( 12/7 × 12/7 ) R10.9° structure with θ=0.58 at saturation exposures. Each of the structures were attached to a specific desorption regime in the TDS spectrum. The position of the C 1s and O 1s core levels indicate single adsorption site in the two lower coverage structure and two different adsorption sites for the most dense adsorption layer.
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