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Tensor LEED analysis of the Ni(111)(root 3x root 3)R30 degrees-Pb surface

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UNSPECIFIED (2002) Tensor LEED analysis of the Ni(111)(root 3x root 3)R30 degrees-Pb surface. PHYSICAL REVIEW B, 65 (23). -. doi:10.1103/PhysRevB.65.233404 ISSN 1098-0121.

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Official URL: http://dx.doi.org/10.1103/PhysRevB.65.233404

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Abstract

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
ISSN: 1098-0121
Official Date: 15 June 2002
Dates:
DateEvent
15 June 2002UNSPECIFIED
Volume: 65
Number: 23
Number of Pages: 4
Page Range: -
DOI: 10.1103/PhysRevB.65.233404
Publication Status: Published

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