Coverage-dependent adsorption sites in the K/Ru(0001) system: a low-energy electron-diffraction analysis
نویسندگان
چکیده
منابع مشابه
Coverage-dependent adsorption sites in the K/Ru(OOOl} system: a low-energy electron-distraction analysis
The two ordered phases p(2 X 2) at a coverage 6’ = 0.25 and ifi X fi)R30” at 6 = 0.33 of potassium adsorbed on Ru(O~l) were analyzed by use of low-energy electron-diffraction (LEED). In the (A x fiJR30” phase, the K atoms occupy threefold hcp sites, while in the p(2 x 2) phase the fee site is favoured. In both phases, the K hard-sphere radii are nearly the same and close to the covalent Pauling...
متن کاملTheory 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 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...
متن کاملLow-Energy Electron Diffraction Amplitudes for a "Bare-Substrate" Model
A theory of low-energy electron dif fraction (LEED) amplitudes is developed for a model in which the crystal surface is represented by a step-function termination of the bulk crystal potential ("bare-substrate" mode l ) . The crystal is considered to be centro-symmetric and it is assumed that either the crystal has a two-fold axis of rotation normal to the surface or the primay beam is normally...
متن کاملCoverage-dependent adsorption sites for K/Cu( 001) and Cs/Cu( 001) determined by surface X-ray diffraction
Surface X-ray diffraction has been used to analyze in situ the room-temperature adsorption behaviour and the structure of K and Cs on Cu(OO1) at submonolayer coverages. Adsorption of K takes place in fourfold hollow sites up to coverages of about 0.25 monolayers (ML), where 1 ML corresponds to 1.53 X lOI atoms/cm2. At higher coverages the formation of a quasi-hexagonal incommensurate adlayer is...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Surface Science Letters
سال: 1992
ISSN: 0167-2584
DOI: 10.1016/0167-2584(92)90195-b