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Numerical simulations of the projectile ion charge difference in solid and gaseous stopping matter

Published online by Cambridge University Press:  15 October 2007

S. Eisenbarth ,
O.N. Rosmej ,
V.P. Shevelko ,
A. Blazevic  and
D.H.H. Hoffmann
S. Eisenbarth*
Affiliation:
Gesellschaft für SchwerionenforschungmbH Darmstadt, Germany
O.N. Rosmej
Affiliation:
Gesellschaft für SchwerionenforschungmbH Darmstadt, Germany
V.P. Shevelko
Affiliation:
P.N. Lebedev Physical Institute, Moscow, Russia
A. Blazevic
Affiliation:
Gesellschaft für SchwerionenforschungmbH Darmstadt, Germany
D.H.H. Hoffmann
Affiliation:
Gesellschaft für SchwerionenforschungmbH Darmstadt, Germany Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
*
Address correspondence and reprint requests to: Svitlana Eisenbarth, Gesellschaft für Schwerionenforschung mbH (GSI), Planckstrasse 1, D-64291 Darmstadt, Germany. E-mail: [email protected]
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Abstract

The dependence of calcium ion subshell populations on the target density during the ion stopping process was analyzed using a five charge-state collisional-radiative model. The model, which consists of the ground and three excited states for every ion charge, was successfully compared with the experiment. The gas-solid difference of calcium ion charge state distribution has been numerically demonstrated. For Ca projectiles with energies of 4–11 MeV/u, the increase of the mean ion charge in solid target is explained by the increase of the total ionization rate and by suppression of the bound electron capture process at high densities of the stopping medium.

Keywords

Collisional-radiative modelGas-solid differenceHeavy ion stopping processIon charge state distributionIon subshells population kineticsProjectile K-shell radiation
Type
Research Article
Information
Laser and Particle Beams , Volume 25 , Issue 4 , December 2007 , pp. 601 - 611
Copyright
Copyright © Cambridge University Press 2007

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