Positron stopping in elemental systems: Monte Carlo calculations and scaling properties

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.51.45
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TypeArticle
Journal titlePhysical review. B, Condensed matter and materials physics
Volume51
Issue1
Pages4559; # of pages: 1
AbstractThe scaling of positron-implantation (stopping) profiles has been reported by Ghosh et al., who used the BNL Monte Carlo scheme to generate stopping profiles in semi-infinite elemental metals. A simple scaling relationship reduced the stopping profiles of positrons implanted at different energies (ranging from 1舑10 keV) onto a single universal curve for that particular metal. We have confirmed that the scaling relationship also applies to the quite different Jensen and Walker Monte Carlo scheme, for more materials, and over an expanded energy range of 1舑25 keV. The mean depths of the stopping profiles calculated by the two Monte Carlo schemes are found to be different, mainly due to differences in the inelastic mean free paths and the energy-loss functions. However, after scaling, the profiles generated by the two schemes can be superimposed onto a single curve which can be appropriately parametrized. The scaled profiles are found to be only weakly material dependent. The mean depths, backscattered fractions, and scaled stopping profiles are fitted to simple parametric functions, and the values of these parameters are obtained for several elements.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Microstructural Sciences
Peer reviewedNo
NPARC number12328289
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Record identifiera312981e-fc26-4eeb-a354-251356a7c973
Record created2009-09-10
Record modified2016-05-09
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