Dynamical Low-energy Electron Diffraction Analyses of Clean and H-adsorbed Ir(111) Surfaces
نویسندگان
چکیده
منابع مشابه
Theory of Low-Energy Electron Diffraction
A method for calculating the intensities of diffracted waves in low energy electron diffraction by crystals is proposed. The elastic multiple scattering is fully taken into account. The cellular method of KOHN and ROSTOKER in the band theory of metals is applied to the integral equation of the scattering by two dimensional lattices, particularly by monatomic layers. The solution is expanded in ...
متن کاملDynamical low-energy electron-diffraction investigation of lateral displacements in the topmost layer of Pd(110).
Based on He-atom diffraction evidence for an order-disorder transition on Pd(110) at 230 K, other authors have proposed a model in which the atoms of the topmost layer are displaced laterally by 0.7 Å along the [001] direction, with the directions of the displacements correlated at T<230 >K, but largely uncorrelated at T>230 K. To test this model, we have examined the proposed ordered phase by ...
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sind die als WELKERsche Regel bekannt gewordenen Gesetzmäßigkeiten 13 und der von Gutbier gefundene Zusammenhang zwischen der Breite der verbotenen Zone und dem partiellen Ionencharakter der Bin dung bei Tetraederstruktur 14. Bei unregelmäßiger Anordnung von gleichen Atomen, wie z. B. in ato maren Schmelzen, trifft die linke Hälfte der Abb. 1 zu, in der keine Energielücke vorhanden ist. Daher...
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The surface structure of the disordered overlayer formed by ethylene adsorption on Pdð111Þ at 80 K is determined by low-energy electron diffraction (LEED) from the effects of chemisorbed molecules on the intensity versus beam energy ðI=EÞ variation of the substrate ð1 1Þ Bragg spots. It is shown that ethylene is di-r-bonded on clean Pdð111Þ, where the measured geometry is in agreement with the ...
متن کاملA Low Energy Electron Diffraction Study of Surface Structures
From the low-energy electron diffraction (LEED) analysis of the (110) surface of palladium we have determined an oscillatory relaxation with respect to the bulk interlayer spacing in the two topmost layers. We used R-factors for quantitative comparison of theoretical I-V curves with the experimental data. The oscillatory relaxation of the surface Pd(110) d12 = (1.33 ± 0.05) Å, d23 = (1.44 ± 0.0...
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ژورنال
عنوان ژورنال: Shinku
سال: 2006
ISSN: 0559-8516,1880-9413
DOI: 10.3131/jvsj.49.313