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Effects of multiple ionization on the Kα spectrum of aluminum in intense lithium beam experiments

Published online by Cambridge University Press:  09 March 2009

P. Wang ,
J.J. MacFarlane  and
G.A. Moses
P. Wang
Affiliation:
Fusion Technology Institute University of Wisconsin-Madison, 1500 Johnson Drive, Madison, WI 53706
J.J. MacFarlane
Affiliation:
Fusion Technology Institute University of Wisconsin-Madison, 1500 Johnson Drive, Madison, WI 53706
G.A. Moses
Affiliation:
Fusion Technology Institute University of Wisconsin-Madison, 1500 Johnson Drive, Madison, WI 53706
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Abstract

The effect of multiple ionization on Kα spectra is investigated for aluminum targets irradiated by intense lithium beams. Multiple ionization cross sections have been calculated using a formulation incorporating single-electron ionization probability in the binomial distribution. In contrast to conventional binary-encounter approximation (BEA) theory, the single-electron ionization probabilities for each atomic shell have been calculated using a combination of modified plane-wave Born approximation (MPWBA) and an empirical effective interaction radius which is dependent on both the target ion and the projectile. Our calculations show that the effect of multiple inner-shell ionization on aluminum Kα spectra observed in intense lithium beam experiments is important. Multiple ionization effects become less important as the target ionization state increases. Nevertheless, even for highly ionized species up through Be-like Al multiple ionization effects can be significant and must be considered in the analysis of spectra obtained in intense Li beam-plasma interaction experiments.

Type
Research Article
Information
Laser and Particle Beams , Volume 13 , Issue 2 , June 1995 , pp. 191 - 200
Copyright
Copyright © Cambridge University Press 1995

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