Abstract
The adsorption of CO on the ordered Ni 3Al(111) surface between 100 and 375 K has been studied using HREELS, TDS, LEED, and work function change measurements (Δ φ). With LEED no additional CO structure could be observed, only a variation of the substrate spot intensities. Three distinct CO desorption states at 440, 370, and 290 K are found, two of which can be directly correlated with adsorption on three-fold ( T des=440 K, ν C–O=226 meV) and on-top sites ( T des=370 K, ν C–O=254 meV), respectively. Below 190 K additional loss peaks appear and are attributed to defect/step-like sites. Both the desorption temperatures and the loss energies are in close agreement with those for CO on Ni(111) and Ni(100). The aluminium atoms in the surface merely act as inert spacers.
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