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Multielectron ionization of atoms by fast ions: an approximation by normalized exponentials

MPG-Autoren
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Kirchner,  T.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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Tawara,  H.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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Shevelko,  V. P.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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Zitation

Kirchner, T., Tawara, H., Tolstikhina, I. Y., Ulantsev, A. D., Shevelko, V. P., & Stöhlker, T. (2006). Multielectron ionization of atoms by fast ions: an approximation by normalized exponentials. Technical Physics, 51(9), 1127-1136.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0011-871F-6
Zusammenfassung
Multielectron ionization of neutral atoms by fast positive ions is considered in terms of the independent particle model. A relatively simple technique for calculating the multielectron ionization probabilities and cross sections through the impact parameter is suggested in which one-electron ionization probabilities are represented as normalized exponentials p nl(b) = p nl(b) = p nl(0)exp(−αnl b), where b is the impact parameter and n and l are quantum numbers of the target atomic shell. Exponent αnl is determined from the Born one-electron ionization cross section for target atoms, and preexponential p nl(0) (the ionization probability at a zero impact parameter) is found from a geometrical model. This technique provides the normalization condition p nl(b) ≤ 1 irrespective of the velocity and charge of striking ions and makes it possible to calculate the one-, two-, and three-electron ionization cross sections, which, when added up, make a major contribution to the total cross section, up to a factor of 2. The results of our computations are compared with experimental data and analytical results of other authors.