Abstract
The adsorption of hydrogen and deuterium on a stepped nickel surface, Ni(510), has been studied using electron energy loss spectroscopy, EELS. At a surface temperature of ~100 K both dissociative and molecular chemisorption is found. For small doses hydrogen atoms adsorb in both hollow sites on the terraces and in low symmetry bridge sites at the steps with a preference for the step sites. For larger exposures, 0.5–0.9 L H 2, a dense layer of hydrogen atoms is formed on the terraces and the coverage increases at the steps where a second kind of step site gets occupied. Finally, for exposures larger than 0.9 L H 2, hydrogen molecules chemisorb at sites above the steps.
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