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

Published online by Cambridge University Press:  22 April 2009

E. Nardi*
Affiliation:
Weizmann Institute of Science, Faculty of Physics, Rehovot, Israel
Y. Maron
Affiliation:
Weizmann Institute of Science, Faculty of Physics, Rehovot, Israel
D.H.H. Hoffmann
Affiliation:
Technische Universität Darmstadt, Institut für Kernphysik, Darmstadt, Germany
*
Address correspondence and reprint requests to: E. Nardi, Weizmann Institute of Science, Faculty of Physics, Rehovot, Israel. E-mail: [email protected]

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.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2009

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