The use of low energy alkali ion scattering as a probe of surface structure |
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| Affiliation: | 1. EMBARQ Brasil, Brazil;2. Laboratorio de Sistemas de Transportes, Universidade Federal do Rio Grande do Sul, Brazil;3. EMBARQ, United States;4. EMBARQ Mexico, Mexico;1. Institute of Surface-Earth System Sciences, School of Earth System Science, Tianjin University, Tianjin 300072, China;2. Department of Geography, The University of Hong Kong, Pokfulam Road, Hong Kong, China;3. College of Resources and Environmental Engineering, Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang 550025, China;1. Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, 410082 Changsha, China;2. Department of Chemical Engineering, Process Engineering for Sustainable Systems (ProcESS), KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium;3. Department of Chemistry and Biochemistry, University of Toledo, Toledo, Ohio 43606-3390;4. Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 |
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| Abstract: | An overview is given of the use of low energy ion scattering as a probe of surface structure with emphasis on work done using alkali ions. Various schemes for extracting structural information from the ion energy and angle distributions are discussed in terms of advantages and disadvantages of each. The scattering potential, which is the primary nonstructural parameter needed for analysis, is discussed in terms of recent experimental results. The structures of clean and reconstructed surfaces are discussed, with examples of measurements of layer relaxations on the Mo (111) surface and missing row reconstructions on the Au (110) and Pt (110) surfaces. Studies of adsorbate covered surfaces are presented with respect to location of the adsorbate and its effect on the structure of the underlying substrate. Finally, examples are given which demonstrate the sensitivity of ion scattering to surface defects and disordering on reconstructed Au (110) and Pt (110) surfaces and unreconstructed Mo (111) surfaces, and to ordering of adsorbates on Mo (001). |
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