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Electronic interaction of slow hydrogen and helium ions with nickel-silicon systems
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.ORCID iD: 0000-0002-1393-1723
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. Johannes Kepler Univ Linz, Atom Phys & Surface, A-4040 Linz, Austria.
Johannes Kepler Univ Linz, Atom Phys & Surface, A-4040 Linz, Austria.
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2019 (English)In: Physical Review A: covering atomic, molecular, and optical physics and quantum information, ISSN 2469-9926, E-ISSN 2469-9934, Vol. 100, no 3, article id 032705Article in journal (Refereed) Published
Abstract [en]

Electronic stopping cross sections (SCSs) of nickel, silicon, and nickel-silicon alloys for protons and helium (He) ions are studied in the regime of medium- and low-energy ion scattering, i.e., for ion energies in the range from 500 eV to 200 keV. For protons, at velocities below the Bohr velocity the deduced SCS is proportional to the ion velocity for all investigated materials. In contrast, for He ions nonlinear velocity scaling is observed in all investigated materials. Static calculations using density functional theory (DFT) available from the literature accurately predict the SCS of Ni and Ni-Si alloy in the regime with observed velocity proportionality. At higher energies, the energy dependence of the deduced SCS of Ni for protons and He ions agrees with the prediction by recent time-dependent DFT calculations. The measured SCS of the Ni-Si alloy was compared to the SCS obtained from Bragg's rule based on SCS for Ni and Si deduced in this study, yielding good agreement for protons, but systematic deviations for He projectiles, by almost 20%. Overall, the obtained data indicate the importance of nonadiabatic processes such as charge exchange for proper modeling of electronic stopping of, in particular, medium-energy ions heavier than protons in solids.

Place, publisher, year, edition, pages
2019. Vol. 100, no 3, article id 032705
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Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-394745DOI: 10.1103/PhysRevA.100.032705ISI: 000485188600002OAI: oai:DiVA.org:uu-394745DiVA, id: diva2:1359586
Funder
Swedish Research Council, 821-2012-5144Swedish Research Council, 2017-00646_9Swedish Foundation for Strategic Research , RIF14-0053Available from: 2019-10-09 Created: 2019-10-09 Last updated: 2019-10-22Bibliographically approved

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Publisher's full texthttps://link.aps.org/doi/10.1103/PhysRevA.100.032705

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