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Articles you may be interested inInfluence of stoichiometry and growth temperature on the crystal structure and magnetic properties of epitaxial L10 Fe-Pd (001) films

Hydrogen adsorption on the ͑1010͒ surfaces of Ru and Re leads to the formation of c(2ϫ2)-3H phases. As determined by quantitative low-energy electron diffraction ͑LEED͒ and density functional theory calculations, hydrogen atoms, as expected, occupy threefold coordinated hcp sites along the densely packed rows and the unexpected short-bridge sites along the ridges in both c(2ϫ2) phases. The Ru and Re substrates reconstruct only weakly and in a very similar fashion under hydrogen chemisorption. Most notably, there is a buckling in the third substrate layer of about 0.06 Å. Probably ͑though not outside the limits of error͒, there are also slightly lateral displacements ͑0.02 Å͒ of top-layer substrate atoms which are bridge-coordinated to hydrogen. The metalhydrogen bond lengths determined for both surfaces correspond to hydrogen radii in the expected range of 0.4-0.7 Å.

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