Abstract
Single and double $K$-shell excitation of Li by 10.6-MeV/nucleon ${\mathrm{N}}^{7+}$ projectiles is investigated by measuring Li autoionization spectra in the energy range from 50 to 90 eV. The ratio for double $K$-shell excitation to single $K$-shell excitation is determined to be about 0.36%. The measured ratio for double-to-single $K$-shell excitation of Li is about a factor of 2 larger than calculations based on independent interactions between the projectile nucleus and each of the Li target electrons, indicating that the electron-electron interaction plays a dominant role in the double $K$-shell excitation of Li in these collisions.
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