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On a peculiarity of low-energy ion scattering from a well-ordered bcc W(2 1 1) surface |
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| Authors: | S.N. Markin S.N. Ermolov M. Sasaki R.G. van Welzenis H.H. Brongersma |
| Affiliation: | a Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands b Institute of Solid State Physics, Russian Academy of Science, Chernogolovka, Russia c Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8573, Japan d Institut fuer Experimentalphysik, Johannes Kepler Universitaet Linz, A-4040 Linz, Austria e Calipso B.V., P.O. Box 513, 5600 MB Eindhoven, The Netherlands |
| Abstract: | A peculiarity in the backscattering of keV He+ ions by a well-ordered high-purity W(2 1 1) surface is reported. Besides the normal elastic binary collision peak and the low-energy tail due to backscattering in deeper layers, an extra peak is observed for an inelastic loss of about 95 eV. This unusually large loss has a constant value over a wide range of primary energies (1.5-4.5 keV). An extra peculiarity is that the peak is only observed for the scattering in normal incidence towards the (2 1 1) plane. It is also not seen for polycrystalline W. The energy loss may be due to a quasi-double or -triple collisions of He particles with the row-trough structure of W(2 1 1) involving electronic excitation of both He and W atoms. Alternatively it may be due to a special channeling/dechanneling process for the incident ions. |
| Keywords: | Low-energy ion scattering (LEIS) Inelastic loss Ion-solid interactions Surface structure Morphology Roughness and topography Tungsten Low-index single crystal surfaces |
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