Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Volume 317, Issue -, Pages 61-65Publisher
ELSEVIER
DOI: 10.1016/j.nimb.2012.12.094
Keywords
LEIS; Electronic stopping; Protons; Germanium; Relative measurements
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Funding
- Austrian Science Fund (FWF) [P 22587] Funding Source: researchfish
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The electronic stopping cross section of protons in polycrystalline Ge is deduced from TOF-LEIS measurements using an amorphized Ge wafer and a thick Cu reference sample. The evaluation is based on the comparison of height ratios of backscattering spectra from both, experiment and Monte Carlo simulations, which allow for multiple scattering of the protons in the sample. This procedure yields the electronic stopping cross section of Ge for protons with a relative uncertainty of less than 10% per data point. In the velocity regime 0.07-0.56 a.u., corresponding to proton energies in the range 120 eV-8 keV, the electronic stopping cross section is linear in the ion velocity. Extrapolation of the data yields a velocity threshold of v(th) = 0.0274 a.u. +/- 10%. At velocities below 0.18 a.u., i.e. at proton energies below 810 eV, electronic stopping in Ge is - compared to Cu - found to be more efficient by up to a factor of 2.6. (C) 2013 Elsevier B.V. All rights reserved.
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