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Multiple scattering versus superstructures in low energy electron diffraction
Affiliation:1. School of Land Science and Technology, China University of Geosciences, Beijing, 100083, China;2. Key Lab of Land Consolidation, Ministry of Land and Resources of the PR China, Beijing, 100035, China;3. China Land Surveying and Planning Institute, Beijing, 100035, China;1. Spintronics Institute, School of Physics and Technology, University of Jinan, Jinan 250022, China;2. Condensed Matter Science and Technology Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China;3. School of Physics, Shandong University, Jinan 250100, China;1. Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA;2. National Security Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA;3. Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA;1. Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany;2. Elettra - Sincrotrone Trieste, S.S. 14 km 163.5 in AREA Science Park, Basovizza, I-34149, Trieste, Italy;3. Fakultät f. Physik and Center for Nanointegration Duisburg-Essen (CENIDE), Universität Duisburg-Essen, D-47048, Duisburg, Germany
Abstract:LEED patterns indicating a long periodicity of the surface layer are discussed in terms of double scattering between short-period structures occurring in the bulk. It is shown that the geometry of the diffraction pattern does not permit a distinction between a true twodimensional superstructure and superposed two- or three-dimensional structures (“pseudosuperstructure”) giving rise to the same lateral periodicity as the superstructure. Several examples for such pseudosuperstructures are given.
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