Abstract
K-shell ionization cross sections of five elements in the range from Ca to Cr have been measured for α-particle and N 7+ -ion bombardments at projectile energies of 5, 6 and 7 MeV/amu. Contributions from the binding energy effect, the polarization effect and the electron transfer effect to these inner-shell ionization are investigated. From the ( Z p / Z s )-dependence of the inner-shell ionization cross section, where Z p is the projectile charge and Z s is the effective atomic number of target atoms, it is found that the binding energy effect and the polarization effect cancel out each other in the present impact-energy region and the charge-transfer cross section is proportional to ( Z p / Z s ) 5 .
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