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Convoy electrons from atomic and molecular heavy ion collisions with solids

  • P. Koschar
  • R. Latz
  • J. Kemmler
  • M. Burkhard
  • H. J. Frischkorn
  • D. Hofmann
  • J. Schader
  • R. Schramm
  • K. O. Groeneveld
  • M. Brenig
  • S. Elston
  • I. A. Sellin
  • W. Meckbach
Experiment, Solid Target
Part of the Lecture Notes in Physics book series (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 zp3.2Ep−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 ).

Keywords

Target Thickness Electron Loss Carbon Foil Monoenergetic Electron Equilibrium Regime 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. [1]
    N. Bohr, Mat.fys.Medd.Dan.Vid.Selsk. 18, 1, (1948)Google Scholar
  2. [2]
    K.G.Harrison and M.W. Lucas, Phys.Lett. A33, 142, (1970)CrossRefGoogle Scholar
  3. [3]
    K.O. Groeneveld, W. Meckbach, I.A. Sellin, J. Burgdörfer, Comments on Atomic and Molecular Physics 4, 187, (1984)Google Scholar
  4. [4]
    R. Shakeshaft, Phys.Rev. A18, 1930, (1978)CrossRefGoogle Scholar
  5. [5]
    F. Drepper and J.S. Briggs, J.Phys. B9, 2063, (1976)Google Scholar
  6. [6]
    M. Breinig, S.B. Elston, S. Huldt, L. Liljeby, C.R. Vane, S.D. Berry, G.A. Glass, M. Schauer, I.A. Sellin, G.D. Alton, S. Datz, S. Overbury, R. Laubert, M. Suter Phys.Rev. A25, 3015, (1982)CrossRefGoogle Scholar
  7. [7]
    W. Brandt, A. Ratkowski, R.H. Ritchie, Phys.Rev.Lett. 33, 1325, (1974)CrossRefGoogle Scholar
  8. [8]
    Z. Vager, B.J. Zabransky, D. Schneider, E.P. Kanter, Gu Yuan Zhuang, D.S. Gemmell, Phys.Rev.Lett. 48, 592, (1982)CrossRefGoogle Scholar
  9. [9]
    D. Röschenthaler, H.D. Betz, J. Rothermel, D.H. Jakubaßa-Amundsen J.Phys. B16, L233, (1983)Google Scholar
  10. [10]
    see “ Molecular Ions ” ( J. Berkowitz, K.O. Groeneveld, ed. ) Plenum Publ.Corp., New York NY Vol.90 (1983)Google Scholar
  11. [11]
    J.M. Gaillard, A.G. de Pinho, J.C. Poizat, J. Remillieux, R. Saoudi, Phys.Rev. A28, 1267, (1983)CrossRefGoogle Scholar
  12. [12]
    R. Latz, J. Schader, H.J. Frischkorn, P. Koschar, D. Hofmann, K.O. Groeneveld, Nucl.Instr.Meth B2, 265, (1984)Google Scholar
  13. [13]
    P. Focke, I.B. Nemirovsky, E. Gonzales Lepera, W. Meckbach, I.A. Sellin, K.O. Groeneveld, Nucl.Instr.Meth B2, 235, (1984)Google Scholar
  14. [14]
    M.F. Steuer, D.S. Gemmell, E.P. Kanter, E.A. Johnson, B.Z. Zabransky, IEEE Transact. NS30, 1069, (1983)Google Scholar
  15. [15]
    G.J. Kumbartzki, H. Neuburger, H.P. Kohl, W. Polster, Nucl.Instr.Meth 194, 29, (1982)CrossRefGoogle Scholar
  16. [16]
    H.J.Frischkorn, P. Koschar, J. Kemmler, R. Latz, J. Schader, K.O. Groeneveld, Nucl.Instr.Meth. B2, 35, (1984)Google Scholar
  17. [17]
    L.H. Toburen and W.E. Wilson, Phys.Rev. A19, 2214, (1979)CrossRefGoogle Scholar
  18. [18]
    H. Folger, GSI Darmstadt, FRG; private communicationGoogle Scholar
  19. [19]
    E.F. Kennedy, D.H. Youngblood, A.E. Blaugrund, Phys.Rev. 158, 897, (1967)CrossRefGoogle Scholar
  20. [20]
    R. Latz, G. Astner, H.J. Frischkorn, P. Koschar, J. Pfennig, J. Schader, K.O. Groeneveld, Nucl.Instr.Meth 194, 315, (1982)CrossRefGoogle Scholar
  21. [21]
    P. Focke, W. Meckbach, C.R. Garibotti, I.B. Nemirovsky, Phys.Rev. A28, 706, (1983)CrossRefGoogle Scholar
  22. [22]
    L.M. Toburen, Phys.Rev. A5, 67, (1971)Google Scholar
  23. [23]
    J.F. Ziegler, in: The Stopping and Ranges of Ions in Matter, vol. V ( Pergamon Press, New York, 1977 )Google Scholar
  24. [24]
    R. Schramm, D. Hofmann, P. Koschar, J. Kemmler, M. Burkhard, E. Rohrbach, H.J. Frischkorn, K.O. Groeneveld, Proc. of the 2nd Int. Conf. on “ High Energy Ion-Atom Collisions ” Debrecen/Hungary, August 1984, ( ed. D.Berenyi et.al. ) and to be published see alsoGoogle Scholar
  25. [24a]
    H.J. Frischkorn, K.O. Groeneveld, D. Hofmann, P. Koschar, R. Latz, J. Schader, Nucl.Instr.Meth. 214, 123, (1983)CrossRefGoogle Scholar
  26. [25]
    W. Meckbach, K.C.R. Chiu, H.H. Brongersma, Mc. Gowan, J. Wu, J.Phys. B10, 3255, (1977)Google Scholar
  27. [26]
    W. König, Dissertation Univ. Marburg, FRG 1979Google Scholar
  28. [27]
    R.W. Cranage, M.W. Lucas, J.Phys. B9, 445, (1976)Google Scholar
  29. [28]
    M. Rødbro and F.D. Anderson, J.Phys. B12, 2883, (1979)CrossRefGoogle Scholar
  30. [29]
    A. Burgess, Mem.Roy.Astr.Soc. 69, 1, (1964)Google Scholar
  31. [30]
    R. Shakeshaft and L. Spruch, Rev.Mod.Phys. 51, 369, (1979)CrossRefGoogle Scholar
  32. [31]
    M.J. Gaillard, J.C. Poizat, A. Ratkowski, J. Remillieux, M. Anzas, Phys.Rev. A16, 2323, (1977)CrossRefGoogle Scholar
  33. [32]
    J.S. Briggs, F. Drepper, J.Phys. B11, 4033, (1978)Google Scholar
  34. [33]
    K. Dettmann, K.G. Harrison and M.W. Lucas, J.Phys. B7, 269, (1974)Google Scholar
  35. [34]
    H.J. Frischkorn, P. Koschar, R. Latz, J. Schader, M. Burkhard, D. Hofmann, K.O. Groeneveld, IEEE Transact. NS30, 931, (1983)Google Scholar
  36. [35]
    I.A. Sellin, S.D. Berry, M. Breinig, C. Bottcher, R. Latz, M. Burkhard, H. Folger, H.J. Frischkorn, K.O. Groeneveld, D. Hofmann, P. Koschar, “ Electron ejection in ion-atom and ion-solid collisions ” ( K.O. Groeneveld, W. Meckbach, I.A. Sellin, ed. ) Lecture Notes in Physics, Springer Verlag, Heidelberg (1985)Google Scholar
  37. [36]
    J. Remillieux, in: “ Molecular Ions ” ( J. Berkowitz, K.O. Groeneveld, ed. ) Plenum Publ.Corp., New York NY Vol. 90 (1983)Google Scholar
  38. [37]
    N. Cue, N.V. De Castro-Faria, M.J. Gaillard, J.C. Poizat and J. Remillieux, Phys.Lett. 72A, 104, (1979)CrossRefGoogle Scholar
  39. [38]
    R. Latz, J. Schader, H.J. Frischkorn, K.O. Groeneveld, D. Hofmann, P. Koschar, Z.Phys. A304, 367, (1982)Google Scholar
  40. [39]
    L. Landau, J.Phys. (USSR) 8, 201, (1944)Google Scholar
  41. [40]
    I. Lindau and W.E. Spicer, J.El.Spectr. and rel.Phen. 3,408, (1974)Google Scholar
  42. [41]
    L.H. Toburen in Nucl.Meth. Monographs 2, p.53 ( D. Berenyi and G. Hock, ed. ) Sci.Publ.Company, Amsterdam 1982Google Scholar
  43. [42]
    Y. Yamazaki and N. Oda, Nucl.Instr.Meth. 194, 415, (1982)CrossRefGoogle Scholar
  44. [43]
    V.H. Ponce, C.E. Gonzalez Lepera, W. Meckbach and I.B. Nemirovsky, Phys.Rev.Lett. 47, 572, (1981)CrossRefGoogle Scholar
  45. [44]
    C.E. Gonzalez Lepera and V.H. Ponce in “ Electron ejection in ion-atom and ion-solid collisions ” ( K.O. Groeneveld, W. Meckbach, I.A. Sellin, ed. ) Lecture Notes in Physics, Springer Verlag, Heidelberg, (1985)Google Scholar
  46. [45]
    P. Koschar, J. Kemmler, M. Burkhard, D. Hofmann, R. Schramm, K.O.Groeneveld, M. Breinig, S. Elston, I.A. Sellin, W. Meckbach, Proc. of the 2nd Int.Conf. on “ High Energy Ion-Atom Collisions ” Debrecen/Hungary, August 1984 ( ed. D. Bereýn et.al.)Google Scholar

Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • P. Koschar
    • 1
  • R. Latz
    • 1
  • J. Kemmler
    • 1
  • M. Burkhard
    • 1
  • H. J. Frischkorn
    • 1
  • D. Hofmann
    • 1
  • J. Schader
    • 1
  • R. Schramm
    • 1
  • K. O. Groeneveld
    • 1
  • M. Brenig
    • 2
  • S. Elston
    • 2
  • I. A. Sellin
    • 2
  • W. Meckbach
    • 3
  1. 1.Institut für KernphysikJ.W.Goethe Universität Frankfurt/MainFrankfurt/MainGermany
  2. 2.Knoxville and Oak Ridge National LaboratoryUniversity of TennesseeOak RidgeUSA
  3. 3.Centro AtómicoBarilocheArgentina

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