Br ions with energies of 13.9 and 25 MeV from the Oak Ridge tandem accelerator have been used to measure ionic charge-state distributions in dilute gas targets of H2, He, and Ar. A least-squares technique has been developed to obtain complete sets of electron charge-exchange cross sections from any number and range of measured nonequilibrium charge distributions. Characteristic irregularities, which originate in the atomic shell structure of the Br ions, have been found in the cross sections for capture of a sing]. e electron. Multiple electron capture and loss, as well as equilibrium charge distributions, are discussed,

In high-velocity ion-atom single collisions, a strong dependence of target x-ray production cross sections upon the ionic charge state has been observed. Experiments were performed in thin gas targets of argon, krypton, and xenon with 35.7-MeV fluorine ions incident in charge states +5 to +9. Production cross sections for Ar K, Kr L, and Xe L characteristic lines increase by as much as a factor of 5 with increasing incident charge state but cannot be fitted by a q 2 dependence.

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