Takashi Tsuda

TL;DR: In this article, high-resolution density dependent intensity ratio measurements for middle charge states of iron in the extreme ultraviolet (EUV) spectral wavelength range of 160−200 A were performed at the Tokyo EBIT laboratory by employing a flat-field grazing incidence spectrometer installed on a low energy compact electron beam ion trap.

TL;DR: In this article, the authors compared the experimental and theoretical spectra of the line intensity ratio problem with the observed intensity ratio in both observatory and laboratory measurements and found that the discrepancy is the fundamental cause of the previously reported inconsistency of the model.

TL;DR: In this article, the experimental results are compared with theoretical cross sections calculated based on fully relativistic wave functions and the distorted wave approximation for the resonance strength of 3p-3d transitions in Fe14+ and Fe15+ excited with a mono-energetic electron beam.

TL;DR: In this paper, the extreme ultraviolet spectra of highly charged Fe ions with a compact electron beam ion trap as a function of monoenergetic electron beam energy was analyzed and the resonance contribution to line intensity ratio, which is important for the diagnostics of astrophysical plasmas was discussed.

TL;DR: In this article, a flat-field grazing incidence spectrometer was employed to record spectra in the wavelength range of 160-230 A. The results were compared with the SERTS 95 active region data and present model calculations.