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Convoy electrons from atomic and molecular heavy ion collisions with solids

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Forward Electron Ejection in Ion Collisions

Part of the book series: Lecture Notes in Physics ((LNP,volume 213))

Abstract

Energy distributions of convoy electrons have been measured for different projectiles ( 0203 MeV/u < Ep/Mp < 2.7 MeV/u) traversing thin carbon foils ( 2 μg/cm2 < px < 20 μg/cm2 ). The motivation of our study is to elucidate the mechanisms of convoy electron production in ion-solid collisions. The analysis of the convoy peak's shape and yield dependence on dwell time td, velocity vp, incident charge state qi and atomic number zp of the projectile shows significant deviations from theories of ECC and ELC in single collision systems. In non-equilibrium of the projectile charge ( td < 2 fs ) the convoy electron yield Yc of atomic heavy ions depends strongly on qi and exhibits an exponential dependence on the dwell time. Here the ELC process prevails. In the higher dwell time regime ( td > 2 fs ) the convoy electron yield Yc is described by Yc zp 3.2Ep −1.3. In comparison to free isotachic electrons the convoy electrons have an effective mean free path <λc> about two up to ten times higher. The value <λc> depends on the velocity vp and the nuclear charge zp and suggests a strong correlation between the convoy electron and the traversing ion. We discuss the observed convoy production and their strong dwell time dependence ( td < 30 fs ).

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Author information

Authors and Affiliations

  1. Institut für Kernphysik, J.W.Goethe Universität Frankfurt/Main, August Euler Straße 6, 6000, Frankfurt/Main, Germany

    P. Koschar, R. Latz, J. Kemmler, M. Burkhard, H. J. Frischkorn, D. Hofmann, J. Schader, R. Schramm & K. O. Groeneveld

  2. Knoxville and Oak Ridge National Laboratory, University of Tennessee, Oak Ridge, Tennessee, USA

    M. Brenig, S. Elston & I. A. Sellin

  3. Centro Atómico, Bariloche, Argentina

    W. Meckbach

Authors
  1. P. Koschar
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  2. R. Latz
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  3. J. Kemmler
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  4. M. Burkhard
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  5. H. J. Frischkorn
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  6. D. Hofmann
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  7. J. Schader
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  8. R. Schramm
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  9. K. O. Groeneveld
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  10. M. Brenig
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  11. S. Elston
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  12. I. A. Sellin
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  13. W. Meckbach
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K. O. Groeneveld W. Meckbach I. A. Sellin

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© 1984 Springer-Verlag

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Koschar, P. et al. (1984). Convoy electrons from atomic and molecular heavy ion collisions with solids. In: Groeneveld, K.O., Meckbach, W., Sellin, I.A. (eds) Forward Electron Ejection in Ion Collisions. Lecture Notes in Physics, vol 213. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-13887-0_33

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  • DOI: https://doi.org/10.1007/3-540-13887-0_33

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  • Print ISBN: 978-3-540-13887-7

  • Online ISBN: 978-3-540-39099-2

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