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Dynamic screening and charge state of fast ions in plasma and solids

  • E. Nardi (a1), Y. Maron (a1) and D.H.H. Hoffmann (a2)

Abstract

This paper addresses the effect of target plasma electrons on the charge state of energetic ions, penetrating a target composed of bound as well as plasma electrons. Dynamic screening of the projectile Coulomb potential by the plasma electrons brings about a depression in the ionization energy of the ionic projectiles, as has been verified experimentally. This in turn makes the ionization cross-sections larger, while making the recombination cross-section smaller, thereby causing an increase in the ion charge state compared to the case of a gas target. The effect of the plasma environment, where the valence electrons are treated as plasma, is illustrated here for a 2 MeV carbon beam penetrating amorphous carbon targets of varying densities.

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Corresponding author

Address correspondence and reprint requests to: E. Nardi, Weizmann Institute of Science, Faculty of Physics, Rehovot, Israel. E-mail: fneran@wisemail.weizmann.ac.il

References

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Dynamic screening and charge state of fast ions in plasma and solids

  • E. Nardi (a1), Y. Maron (a1) and D.H.H. Hoffmann (a2)

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