Abstract
AbstractRecent results and experimental plans in X‐ray spectroscopic studies of highly charged ions at the Tokyo EBIT (Electron Beam Ion Trap) are presented. We have been using a flat crystal spectrometer to observe X‐ray transitions in the energy range of 3–10 ke V. It has been used to investigate the strong configuration mixing in neonlike ions, the electron‐impact excitation of highly charged ions, the polarization of Ly‐α in hydrogenlike Ti21+, and so on. A Johansson type of spectrometer has been constructed to observe X‐ray transitions in the higher energy range, 10–30 keV. It will be used for high‐resolution spectroscopy of the Lyman series in hydrogenlike medium‐Z ions. In particular, an inter comparison method between Ly‐α of In48+and Ly‐β of Rh44+ is proposed to measure the 1s Lamb shift precisely. It will provide a precise test of the QED theory in the strong field regime.
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