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Charge-state dependence for K-shell x-ray production cross sections in 13 Al bombarded by 2-12-MeV 6 C ions with charge states from 2ϩ to 6ϩ was measured using a Si͑Li͒ detector. A thin Al target was used to ensure single collision conditions. Contributions of the electron capture as well as direct ionization to the inner-shell ionization were determined by an analysis of the charge-state dependence of the target x-ray production. The measurements are compared with the prediction of the ECPSSR theory using a single-hole fluorescence yield. The ECPSSR theory is based on the perturbed stationary state ͑PSS͒ formalism and relativistic effects ͑R͒ for the target electrons, and energy loss ͑E͒ and Coulomb deflection ͑C͒ of the projectile. In general, this theory gives reasonable agreement with the data for carbon ions without K vacancies while it overpredicts the data for carbon ions with K vacancies. The significant underprediction of the data at the lowest energy is likely associated with the molecular-orbital effect that is not accounted for in the ECPSSR theory.

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