Fast LEED intensity measurements with a video camera and a video tape recorder

Lang, Elmar; Heilmann, P.; Hanke, G.; Heinz, K.; Müller, K.

doi:10.1007/bf00900472

Cited by 63 publications

(4 citation statements)

References 6 publications

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“…4 The (1x2) phase was formed by exposure of the clean Ni(llO) surface to 2L H2 (1 L = 10 " 6 Torr sec) at 120 K. The LEED intensity-voltage (I-V) data were recorded by the use of a computerinterfaced video system. 16 Normal incidence of the primary beam was verified by a comparison of the spectra from four symmetrically equivalent beams, which procedure proved to be very sensitive towards small angular deviations. The final experimental data were obtained by averaging of the I-V spectra from beams which are symmetrically equivalent at normal incidence.…”

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confidence: 99%

Structure determination of an adsorbate-induced multilayer reconstruction: (1×2)-H/Ni(110)

et al. 1987

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The reconstructed (1x2) structure formed by saturation of a Ni(l 10) surface with adsorbed H atoms at T < 180 K was investigated by LEED. Excellent agreement between experimental and calculated I-V spectra for eleven nonequivalent beams was obtained for a model in which parallel rows of Ni atoms in the topmost layer are laterally shifted by 0.3 A ("row pairing") and which exhibits periodic vertical displacements ("buckling") of the atoms in the second layer.

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confidence: 99%

Structure determination of an adsorbate-induced multilayer reconstruction: (1×2)-H/Ni(110)

et al. 1987

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“…The standard experimental set -up for collecting LEED I -V curves uses a video camera for recording images of the fl uorescent screen for each energy (Video LEED) [31] . When a conventional video camera is used, the rate at which images are collected is fi xed at 50 -60 Hz.…”

Section: Experimental Techniquesmentioning

confidence: 99%

Low‐Energy Electron Diffraction (LEED)

Held

2011

Surface and Thin Film Analysis

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Principles and HistoryWhen Davisson and Germer reported, in 1927, that the elastic scatting of lowenergy electrons from well -ordered surfaces leads to diffraction spots similar to those observed in X -ray diffraction [1 -3] where h is Planck ' s constant, m e the electron mass, v the velocity, and E kin the kinetic energy of the electron. Already, Davisson and Germer realized that the diffraction of low -energy electrons (also termed low -energy electron diffraction ; LEED ) could be used to determine the structure of single crystal surfaces, in analogy to X -ray diffraction, if their kinetic energy was between 40 and 500 eV -that is, if their wavelength ranged between 0.5 and 2 Å . Due to their small inelastic mean free path ( IMFP ) of only a few Å ngstroms (typically < 10 Å ), electrons in this energy range sample only the topmost atomic layers of a surface and are, therefore, better suited for the analysis of surface geometries than X -ray photons, which have a much larger mean free path (typically of a few micrometers). However, unlike for photon diffraction, multiple scattering plays an important role in the diffraction process of electrons at solid surfaces. Therefore, the analysis of LEED data with respect to the exact positions of atoms at the surface is somewhat more complicated, and requires fully dynamical quantum mechanical scattering calculations. The use of LEED for surface analysis became important when suffi ciently large single crystals became available for surface studies. Initially, the technique was used only for the qualitative characterization of surface ordering and quantitative determination of the two -dimensional ( 2 -D ) surface lattice parameters (e.g., superstructures, see below). Information regarding the positions of the atoms in the

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“…For complex ordered structures with many diffraction spots, it is mostly a matter of more conveniently acquiring the larger amount of data. This favors automated systems, for instance video LEED [43][44][45].…”

Section: Experimental Requirementsmentioning

confidence: 99%

Solving Complex and Disordered Surface Structures with Electron Diffraction

Hove

1988

Chemistry and Physics of Solid Surfaces VII

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The past of surface structure determination with low-energy electron diffraction (LEED) will be briefly reviewed, setting the stage for a discussion of recent and future developments. The aim of these developments is to solve complex and disordered surface structures. Some efficient solutions to the theoretical and experimental problems will be presented. Since the theoretical problems dominate, the emphasis will be on theoretical approaches to the calcula tion of the multiple scattering of electrons through complex and disordered surfaces.

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Fast LEED intensity measurements with a video camera and a video tape recorder

Cited by 63 publications

References 6 publications

Structure determination of an adsorbate-induced multilayer reconstruction: (1×2)-H/Ni(110)

Structure determination of an adsorbate-induced multilayer reconstruction: (1×2)-H/Ni(110)

Low‐Energy Electron Diffraction (LEED)

Solving Complex and Disordered Surface Structures with Electron Diffraction

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