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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