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Quasi-resonant neutralization of He+ ions at a germanium surface
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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2013 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 25, no 48, 485006- p.Article in journal (Refereed) Published
Abstract [en]

When low-energy He ions are scattered from a Ge surface, the fraction of positive ions exhibits characteristic oscillations as a function of ion energy. These oscillations are caused by quasi-resonant neutralization (qRN), a process which is active for materials with a narrow band nearly resonant with the unperturbed He 1s-level. In this paper we measure the fraction of He+ backscattered from Ge(100). In conjunction with recently developed theoretical methods, we extract quantitative information on the efficiency of qRN. Our evaluation reveals that qRN is a highly efficient process leading to ion fractions two orders of magnitude lower than in systems for which neutralization is only due to Auger processes.

Place, publisher, year, edition, pages
2013. Vol. 25, no 48, 485006- p.
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-212826DOI: 10.1088/0953-8984/25/48/485006ISI: 000327138300016OAI: oai:DiVA.org:uu-212826DiVA: diva2:680492
Available from: 2013-12-18 Created: 2013-12-16 Last updated: 2014-01-29Bibliographically approved

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Primetzhofer, Daniel
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Applied Nuclear Physics
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