Fig. 5
Ionization cross sections of H2 by proton and 56Fe projectiles as function of the energy per u. The upper curves correspond to Fe projectiles and the lower curves to proton. Full lines correspond to Rudd et al. (1983) semi-empirical law (formula (17)) scaled as explained in the text and dashed lines to the semi-empirical law (formula (82)) of Kaganovich et al. (2006).
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