The Theoretical Study of Multiple Ionization of C₆₀ Fullerene by Fast Proton Impact

抄録

We theoretically studied the n-th multiple ionization cross section, σ_n (n=1,2), of the C₆₀ fullerene in collisions with protons at impact energies of 150 keV to 2 MeV, on the basis of the impact-parameter dependent ionization probability per atom, in the independent-atom picture. The dependence of σ_n on the incident-beam direction was found, where the alignment of two carbon atoms is important. The present results are in better agreement with the recent experimental data, than the statistical energy deposition model.