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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 ,
Y. Maron  and
D.H.H. Hoffmann
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: fneran@wisemail.weizmann.ac.il
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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.

Keywords

Charge state of projectile ionsDynamic screeningEnergy loss of ionsDensity effect solid state plasmaIonizationRecombination
Type
Research Article
Information
Laser and Particle Beams , Volume 27 , Issue 2 , June 2009 , pp. 355 - 361
Copyright
Copyright © Cambridge University Press 2009

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