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Radiative stabilization following transfer of two electrons to Xeq+ (q ≤ 35) in slow collisions with He and Xe

  • H. Cederquist
Conference paper

Abstract

We present a derivation of an ECB-based relation between the branching ratio for autoionization F and the ratio between the cross sections for transfer ionization and single-electron capture. We apply this method to two different experimental results. The method yields semi-empirical upper limits for F of unity for double Rydberg levels formed in Xe q+-He collisions for charge states up to q=29. The fact that direct measurements of σTI/(σTI + σDC) leads to values in the range 0.9<.F<1.0 for the He collisions gives strong support for using the model for the Xe q+-Xe results, where no direct measurements of true double-capture cross sections were made. The latter results show a rather strong decrease of the upper limits for F to values significantly below unity for q>25. We point out that the apparent discrepancy between the results obtained for He and Xe targets at high q could be explained by population of higher angular momentum (l, l′) states in the latter case.

Keywords

Transfer Ionization Model Cross Section High Angular Momentum Collision Velocity Target Electron 
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References

  1. 1.
    H. Andersson, G. Astner, and H. Cederquist, J. Phys. B: At. Mol. Opt. Phys. 21, L187 (1988).CrossRefADSGoogle Scholar
  2. 2.
    H. Cederquist et al. ,Phys. Rev. Lett. 62, 1465 (1989).CrossRefADSGoogle Scholar
  3. 3.
    H. Andersson et al. ,Physica Scripta, 42, 150 (1990).CrossRefADSGoogle Scholar
  4. 4.
    A. Bárány et al. ,Nucl. Instr. Meth. B 9, 397 (1985).CrossRefADSGoogle Scholar
  5. 5.
    P. Hvelplund et al. ,Nucl. Instr. Meth. B 9, 421 (1985).CrossRefADSGoogle Scholar
  6. 6.
    A. Bordenave-Montesquieu et al. ,J. Phys. B: At. Mol. Phys. 17, L127 (1984).CrossRefADSGoogle Scholar
  7. 7.
    P. Moretto-CapeUe et al. ,J. Phys. B: At. Mol. Opt. Phys. 22, 271 (1989).CrossRefADSGoogle Scholar
  8. 8.
    P. Rocin et al. ,Europhys. Lett. 3, 53 (1987).CrossRefADSGoogle Scholar
  9. 9.
    H. Laurent et al. ,J. Phys. B: At. Mol. Phys. 20, 6581 (1987).CrossRefADSGoogle Scholar
  10. 10.
    C. Biedermann et al. ,Phys. Rev. A 41, 5889 (1990).CrossRefADSGoogle Scholar
  11. 11.
    R.K. Janev and L.P. Presnyakov, Phys. Rep. 70, 1 (1981).CrossRefADSGoogle Scholar
  12. 12.
    J.E. Hansen J. de Phys. (Paris) 50 Cl-603 (1989).Google Scholar
  13. 13.
    T. Iwai et al. ,J. Phys. B: At. Mol. Phys. 17, L95 (1984).CrossRefADSGoogle Scholar
  14. 14.
    H. Tawara et al. ,J. Phys. B: At. Mol. Phys. 18, 337 (1985).CrossRefADSGoogle Scholar
  15. 15.
    R. Mann, Z. Phys. D 3, 85 (1986).CrossRefADSGoogle Scholar
  16. 16.
    H. Cederquist, Phys. Rev. A, submitted (1990).Google Scholar
  17. 17.
    A. Miiller and A. Salzborn, Phys. Lett. 62A, 391 (1977).ADSGoogle Scholar
  18. 18.
    E.H. Nielsen et al. ,J. Phys. B: At. Mol. Phys. 18, 1789 (1985).CrossRefADSGoogle Scholar
  19. 19.
    A. Miiller, C. Achenbach, and E. Salzborn, Phys. Lett. 70A, 410 (1979).ADSGoogle Scholar
  20. 20.
    D.H. Crandall, R.A. Phaneuf, and F.W. Meyer, Phys. Rev. A 22, 379 (1980).CrossRefADSGoogle Scholar
  21. 21.
    E.H. Nielsen et al. ,J. Phys. B: At Mol. Phys. 17, L139 (1984).CrossRefADSGoogle Scholar
  22. 22.
    Y. Nakai and T. Shirai, Physica Scripta T28, 77 (1989).CrossRefADSGoogle Scholar
  23. 23.
    C. Biedermann et al. ,Phys. Rev. A, accepted (1990).Google Scholar
  24. 24.
    D. Dijkkamp et al., J. Phys. B: At. Mol. Phys., 4763 18 (1985).Google Scholar
  25. 25.
    D. Vernhet et al., J. Phys. B: At. Mol. Opt. Phys. 21, 3949 (1988).CrossRefADSGoogle Scholar
  26. 26.
    E.U. Condon and G.H. Shortly, The theory of Atomic Spectra ,pp. 136, London: Cambridge University Press 1935.Google Scholar
  27. 27.
    W.E. Cooke and T.F. Gallagher, 19, 2151 (1979).Google Scholar

Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • H. Cederquist
    • 1
  1. 1.Manne Siegbahn Institute of PhysicsStockholmSweden

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