Barkas effect,shell correction,screening and correlation in collisional energy-loss straggling of an ion beam |
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Authors: | P Sigmund A Schinner |
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Institution: | 1.Physics Department, University of Southern Denmark, 5230 Odense M, Denmark,DK;2.Institut für Experimentalphysik, Johannes-Kepler-Universit?t, 4040 Linz-Auhof, Austria,AT |
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Abstract: | Collisional electronic energy-loss straggling has been treated theoretically on the basis of the binary theory of electronic
stopping. In view of the absence of a Bloch correction in straggling the range of validity of the theory includes both the
classical and the Born regime. The theory incorporates Barkas effect and projectile screening. Shell correction and electron
bunching are added on. In the absence of shell corrections the Barkas effect has a dominating influence on straggling, but
much of this is wiped out when the shell correction is included. Weak projectile screening tends to noticeably reduce collisional
straggling. Sizable bunching effects are found in particular for heavy ions. Comparisons are made with selected results of
the experimental and theoretical literature.
Received 24 September 2002 / Received in final form 1st December 2002 Published online 4 February 2003 |
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Keywords: | PACS 34 50 Bw Energy loss and stopping power – 52 40 Mj Particle beam interactions in plasmas |
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