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Crystal effects in the Neutralization of He+ ions in the low energy ion scattering regime

AuthorsPrimetzhofer, D.; Markin, S. N.; Juaristi Oliden, Joseba Iñaki ; Taglauer, E.; Bauer, P.
KeywordsInteractions of atoms and molecules with surfaces
Metallic surfaces
Ion scattering from surfaces
Atomic, molecular and ion beam impact and interactions with surfaces
Issue Date28-May-2008
PublisherAmerican Physical Society
CitationPhysical Review Letters 100, 213201 (2008).
AbstractInvestigating possible crystal effects in ion scattering from elemental surfaces, measurements of the positive ion fraction P+ are reported for He+ ions scattered from single and polycrystalline Cu surfaces. In the Auger neutralization regime, the ion yield is determined by scattering from the outermost atomic layer. For Cu(110) P+ exceeds that for polycrystalline Cu by up to a factor of 2.5, thus exhibiting a strong crystal effect. It is much less pronounced at higher energies, i.e., in the reionization regime. However, there a completely different angular dependence of the ion yield is observed for poly- and single crystals, due to massive subsurface contributions in nonchanneling directions.
Description4 pages.-- PACS nrs.: 34.35.+a, 68.47.De, 68.49.Sf, 79.20.Rf.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.100.213201
Appears in Collections:(CFM) Artículos
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