نتایج جستجو برای: leed
تعداد نتایج: 943 فیلتر نتایج به سال:
The structure of clean Be~101̄0! was determined by low-energy electron-diffraction ~LEED! I(V) analysis and the result compared to first-principles calculations. Both theory and experiment indicate that from the two possible terminations of the truncated bulk, the one with the shorter first-interlayer spacing is realized. The values for the multilayer relaxations obtained by LEED essentially coi...
The temperature dependence of the first three interlayer distances of the Ag(111) surface was studied by low-energy electron diffraction (LEED) over the temperature range 128K to 723 K. The first three interlayer spacings and the effective Debye temperatures were extracted from the LEED analysis. At the lowest temperature, the first two interlayer spacings are slightly (0.5 %) contracted. All t...
The clean Ta(100) surface and some aspects of hydrogen adsorption have been studied by LEED and AES. The thorough examination of LEED patterns did not provide any evidence for an atomic reconstruction of the clean surface over the entire temperature range investigated, 150-600 K. The r-factor analysis used for comparison between measured and calculated IV spectra yields a contraction of the top...
We report on the growth of single crystalline epitaxial Bi films on W(1 1 0). X-ray photoelectron diffraction (XPD) and low energy electron diffraction (LEED) reveal that Bi grows well ordered in the pseudocubic (0 0 1) orientation. The two-fold symmetric W(1 1 0) surface supports four different Bi(0 0 1) domains. The multi-domain nature is unambigously detected via LEED showing a peculiar spli...
The atomic structure of the (1120) surface of cobalt has been determined by LEED using six intensity spectra at normal incidence. The surface exhibits the truncated bulk structure with a contraction of the first interlayer spacing by about 8.5% with respect to the bulk value. Quantitative evaluation of the LEED spectra was done using Zanazzi and Jona’s and Pendry’s r-factors. The minimum averag...
Purpose: This study aimed to carry out a comprehensive analysis of genetic and epigeAuth UKM Unive Leed Onco Rece 12/8/0 Note Rese Requ Centr Unite R.Ban
We demonstrate the direct reconstruction of 3D atomic images from measured low-energy electron diffraction (LEED) intensity spectra. A multiple-incident angle and multiple-energy integral are first applied to the spectra to obtain a map of interatomic vectors. From this map, a nonbulk interatomic vector is chosen that points to a desired reference atom. A second integral transformation, using t...
Adsorption of CO on a Pd monolayer (ML) supported on Mo(ll0) has been studied using low energy electron diffraction (LEED), temperature programmed desorption (TPD), and high resolution electron energy loss spectroscopy (HREELS). Three ordered CO substructures denoted as (~ Jl) (-21 ~), and (~ ~l) are observed with LEED. The binding energy of CO on the 1.0 ML Pd/Mo(ll0) surface is reduced by 12 ...
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