Equilibrium charge distributions for B, C, N ions passing through matter

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Equilibrium charge state distributions for fast ( ν > ν 0, ν 0: Bohr velocity) B, C, and N ions penetrating through solid and gaseous targets are investigated by utilizing the atomic collision theory. For the electron capture process, the two-state atomic expansion method is used and the electron capture into the excited state of an ion from a target atom is taken into account. On the other hand, for the electron loss process, the Bon approximation is used. As the velocity of an ion increases, the equilibrium mean charge becomes saturated and the distribution width becomes narrower. Numerical calculations for charge state distributions show good agreement with the experimental results.