Stopping of swift hydrogen diclusters: oscillator model
. Enhanced stopping of swift hydrogen diclusters has been analysed theoretically. The target has been modeled as a gas of harmonic-oscillator atoms of variable density. This model predicts a proximity effect, i.e., enhanced stopping at high beam energy, and an oscillatory behavior at low energy. Bot...
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Published in | The European physical journal. D, Atomic, molecular, and optical physics Vol. 61; no. 1; pp. 39 - 50 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer-Verlag
2011
EDP Sciences |
Subjects | |
Online Access | Get full text |
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Summary: | .
Enhanced stopping of swift hydrogen diclusters has been analysed theoretically. The target has been modeled as a gas of harmonic-oscillator atoms of variable density. This model predicts a proximity effect, i.e., enhanced stopping at high beam energy, and an oscillatory behavior at low energy. Both features get less pronounced with increasing target density due to increased screening of the ion-target interaction by polarization of the medium. Static screening by electrons accompanying the cluster likewise reduces the proximity effect. The Barkas-Andersen correction has been estimated in the
limit. Our findings are in contrast with measurements on SiO
2
[S.M. Shubeita et al., Phys. Rev. B
77
, 115327 (2008)] which showed a pronounced step in the energy dependence of the proximity effect. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1434-6060 1434-6079 |
DOI: | 10.1140/epjd/e2010-10144-9 |