Abstract
We have studied coadsorbed CO and H on the stepped Pt(335) surface with electron energy loss spectroscopy and temperature-programmed desorption. Radically different coadsorption behavior is found on the step edges and the terraces. Along the edge coadsorbed H strongly affects CO's vibrational spectrum, shifting CO from atop to bridge sites and enhancing the cross section of bridge CO. On the terrace coadsorbed H has virtually no effect on CO's spectrum, even at very high H coverage. Both of these behaviors differ from the interactions observed on Pt(111). Possible explanations are discussed.
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