Mechanisms for Electron Production in 30-MeVOn++O2Collisions

Absolute cross sections for electron emission in the complete energy and angular ranges were measured for 30-MeV ${\mathrm{O}}^{n+}$+${\mathrm{O}}_{2}$ collisions at incident charge states of $n=4 \mathrm{to} 8$. Rises in inner- and outer-shell ionization of the target are studied for increasing $n$. Electrons ejected from the outer shell of the projectile are found to be very intense at forward emission angles $\ensuremath{\theta}$. Auger electrons from the projectile are observed at $\ensuremath{\theta}l42\ifmmode^\circ\else\textdegree\fi{}$ for $n$ as large as 6.