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Matrix effects in the neutralization of He ions at a metal surface containing oxygen
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
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2013 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 609, 167-171 p.Article in journal (Refereed) Published
Abstract [en]

Charge exchange between He ions and a Ni(111) surface containing oxygen was studied by Low-Energy Ion Scattering, using 1.25 key He+ as primary ions. The energy resolved yield of positive ions was detected after backscattering from Ni or O for different exposures of Ni(111) to molecular oxygen. Pronounced changes in the neutralization efficiency due to the presence of oxygen are observed for both, the adsorbate phase at low oxygen dose, and the NiO phase at high dose. The presence of O in the surface makes resonant charge transfer in a close collision possible. Evidence for a strong matrix effect is found: O in NiO neutralizes much more efficiently than O in the adsorbate phase. Independently, the different interaction stages of Ni-O and the surface structure were monitored by Photoelectron-Emission-Microscopy and Low-Energy Electron Diffraction.

Place, publisher, year, edition, pages
2013. Vol. 609, 167-171 p.
Keyword [en]
Low energy ion scattering, LEIS, Charge exchange processes, Surface composition analysis, Metal oxide
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-197650DOI: 10.1016/j.susc.2012.12.003ISI: 000315609200027OAI: oai:DiVA.org:uu-197650DiVA: diva2:613920
Available from: 2013-04-02 Created: 2013-04-02 Last updated: 2017-12-06Bibliographically approved

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Primetzhofer, Daniel

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