Autoionization of He atoms following double excitation by electrons, protons, C~+ (Q =4-6), and Fo+ (Q =7-9) ions has been studied. The electron-emission yields from the doubly excited 2s ('S), 2s2p('P), and 2p ('P) states were measured at the reduced projectile energy of 1.5MeV/nucleon for observation angles between 10' and 60'. The results indicate excitation to the 2s'('S) and 2p~('D) states increases as approximately Q', while excitation to the 2s2P('P) state varies as approximately Q', where Q is the charge of the projectile. These charge dependences are significantly less than the Q dependence expected in the independent-electron model, suggesting the interaction between the two target electrons is important in creating the doubly excited states.

We have studied the detailed energy balance in collisions of 10-MeV C 6+ ions with Ne. In these collisions, the Ne is multiply ionized and the C ion may emerge as either C 6+ or C 5+ . Projectile energy loss and scattering angle for a given carbon-ion charge state were determined in a high-resolution magnetic spectrograph and were measured in coincidence with the formation of a given Ne recoil-ion charge state. The amount of energy transferred to the continuum electrons exceeds, by far, the sum of the values of the ionization potentials.

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