Charge-state-specific EUV spectra of Xe ions

Charge state specific extreme ultraviolet spectra from xenon ions have been recorded at Tokyo Metropolitan University. The Electron Cyclotron Resonance Source spectra were produced from charge exchange collisions between the xenon ions and rare gas target atoms. Atomic structure calculations were performed for Xe ¹⁶⁺ - Xe²⁰⁺ using the Hartree-Fock with Configuration Interaction code of Cowan and showed that the spectra arise from 4p-4d and 4d-4f transitions. In addition it was necessary to allow for selective capture processes that occur in these slow collisions. The energies of the capture states involved in the single electron process are estimated using the classical over barrier model.