Igor D Kaganovich et al 2006 New J. Phys. 8 278 doi:10.1088/1367-2630/8/11/278
Scaling and formulary of cross-sections for ion–atom impact ionization
Focus on Accelerator and Beam PhysicsIgor D Kaganovich, Edward Startsev and Ronald C Davidson
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The values of ion–atom ionization and stripping cross-sections are frequently needed for many applications that utilize the propagation of fast ions through matter. When experimental data and theoretical calculations are not available, approximate formulae are frequently used. This paper briefly summarizes the most important theoretical results and approaches to cross-section calculations in order to place the discussion in historical perspective and offer a concise introduction to the topic. Based on experimental data and theoretical predictions, a new fit for ionization cross-sections is proposed. The range of validity and accuracy of several frequently used approximations (classical trajectory, the Born approximation, and so forth) are discussed using, as examples, the ionization cross-sections of hydrogen and helium atoms by various fully stripped ions. A formulary of analytical approximations for cross-sections is presented.
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Issue 11 (November 2006)
Received 5 April 2006
Published 28 November 2006
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Scaling and formulary of cross-sections for ion–atom impact ionization
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