Abstract
The cross-section ratio for double-to-single ionization has been investigated for collisions of 95-MeV/amu ${\mathrm{N}}^{7+}$ with He and Li target atoms. The measured values for Li and He are equal within the experimental uncertainties. First-order perturbation theory suggests that double ionization of Li is dominated by electron-nuclear interaction, whereas double ionization of He is dominated by electron-electron interactions such as shake-off and initial-state correlation. First-order perturbation theory can describe the ratio of double to single ionization of ${\mathrm{N}}^{7+}$+Li at 95 MeV/amu within the experimental uncertainties.
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