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  Comprehensive study of the surface peak in charge-integrated low-energy ion scattering spectra

Draxler, M., Beikler, R., Taglauer, E., Schmid, K., Gruber, R., Ermolov, S. N., et al. (2003). Comprehensive study of the surface peak in charge-integrated low-energy ion scattering spectra. Physical Review A, 68: 022901. doi:10.1103/PhysRevA.68.022901.

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Draxler, M.1, Author
Beikler, R.2, Author              
Taglauer, E.3, Author              
Schmid, K.3, Author              
Gruber, R.1, Author
Ermolov, S. N.1, Author
Bauer, P.2, Author              
Affiliations:
1Johannes-Kepler Universität Linz, Institut für Experimentalphysik, A-4040 Linz, Austria; Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow District 142432, Russia, ou_persistent22              
2External Organizations, ou_persistent22              
3Material Research (MF), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856328              

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 Abstract: Low-energy ion scattering is very surface sensitive if scattered ions are analyzed. By time-of-flight (TOF) techniques, the neutral and the charge-integrated spectra (ions plus neutrals) are obtained, which yield information about deeper layers. It is well known that charge integrated spectra may exhibit a surface peak which is more pronounced for heavier projectiles, e.g., Ne ions. Aiming at a more profound physical understanding of this surface peak, we performed TOF experiments and computer simulations for H, He, and Ne projectiles scattered from a polycrystalline copper target. Measurements were done in the range of 1–9 keV for a scattering angle of 129° under UHV conditions. The simulations were performed using the MARLOWE code for the given experimental parameters and a polycrystalline target. In the experiments, a pronounced surface peak was observed at low energies, which fades away at higher energies. This peak is quantitatively reproduced by the simulation. Several atomic layers may contribute to the surface peak, depending on the energy. Analyzing the contributions of the individual outermost atomic layers, one finds that the binary collisions of the projectiles with atoms in the first and the second layer yield a narrow energy distribution, while the contribution from the deeper layers is dominated by multiple scattering and therefore exhibits a very broad energy spectrum. It is shown that the appearance of a more or less pronounced surface peak is due to the relative contributions of single scattering and multiple scattering and thus depends on the projectile energy and mass.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
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 Rev. Type: Peer
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Title: Physical Review A
  Alternative Title : Phys. Rev. A
Source Genre: Journal
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Publ. Info: Copyright © 2003 The American Physical Society
Pages: - Volume / Issue: 68 Sequence Number: 022901 Start / End Page: - Identifier: -