X-ray and extreme-ultraviolet spectra from collisions of Ar¹⁸⁺ and O⁸⁺ ions with neutrals

We present measurements of K-shell X-ray emission following charge exchange of fully ionized argon with various neutral gaseous targets at small collision energies inside an electron beam ion trap. We also resolve the principal quantum number of electron capture in extreme-ultraviolet spectra from initially bare and hydrogen-like oxygen ions held in the same trap. We analyze discrepancies between these as well as previous measurements with theoretical models based on the multichannel Landau–Zener approach.