Tensor LEED analysis of the Ni(111)(root 3x root 3)R30 degrees-Pb surface
UNSPECIFIED. (2002) Tensor LEED analysis of the Ni(111)(root 3x root 3)R30 degrees-Pb surface. PHYSICAL REVIEW B, 65 (23). -. ISSN 1098-0121Full text not available from this repository.
Official URL: http://dx.doi.org/10.1103/PhysRevB.65.233404
The structure of the Ni(111)(root3xroot3)R30degrees-Pb surface has been determined by quantitative low-energy electron diffraction (LEED), using multiple-scattering simulations of the measured diffracted beam intensities with a tensor-LEED program. The results confirm that the surface comprises a single-layer substitutional alloy of stoichiometry Ni2Pb (with all atoms in "fcc" sites relative to the underlying Ni) and clearly excludes a surface/subsurface stacking fault (with occupation of "hcp" sites) like that found for similar phases of Sb on Cu(111) and Ag(111). Within the surface alloy layer the Pb atoms are 0.73+/-0.05-Angstrom higher above the surface than the surrounding Ni atoms in the alloy layer. This magnitude of rumpling is in excellent agreement with a recent medium-energy ion scattering investigation of this surface, but is significantly larger than that of an earlier low-energy ion scattering investigation. Compared to the rumpling amplitude of 1.67 Angstrom expected from a simple hard-sphere model based on bulk metallic radii, however, it confirms a strong reduction of the effective atomic radii in this surface alloy.
|Item Type:||Journal Article|
|Subjects:||Q Science > QC Physics|
|Journal or Publication Title:||PHYSICAL REVIEW B|
|Publisher:||AMERICAN PHYSICAL SOC|
|Date:||15 June 2002|
|Number of Pages:||4|
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