Abstract
Cross sections for single electron emission have been measured in collisions of $95\mathrm{MeV}/\mathrm{u}{\mathrm{Ar}}^{18+}$ with atomic Li for electron energies 5--1000 eV and angles 25\ifmmode^\circ\else\textdegree\fi{}--155\ifmmode^\circ\else\textdegree\fi{}. The high projectile velocity made possible the separation of two- and three-body processes in the angular distributions of the ejected electrons. Low-energy emission of the $2s$ electrons is found to be significantly influenced by two-body effects and, furthermore, the node in the Li $2s$ wave function manifests itself in the angular spectra. Emission of $1s$ electrons is attributed mainly to three-body effects. The two- and three-body processes are associated with Compton scattering and photoabsorption, respectively.
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