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Evidence is presented of an excitation process in ion-atom collisions analogous to electron-impact excitation in free-electron-ion collisions. The production of Xslslp 4 P projectile states excited in collisions of (\s 2 2s) O s+ and F 6+ with He and H2 targets was found to increase with projectile energy above ^0.75 MeV/u, in agreement with an impulse-approximation treatment of Is-* 2p electron-impact excitation of ions in collisions "quasifree" target electrons. Such ion-atom excitations could provide presently unavailable information about inner-shell electron-impact excitation.

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