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UV and x-ray spectral lines of Fe XXIII ion for plasma diagnostics

We have calculated x-ray and UV spectra of Be-like Fe (Fe XXIII) ions in a collisional radiative model including all fine-structure transitions among the 2s2, 2s2p, 2p2, 2snl and 2pnl' levels where n = 3 and 4, adopting data for the collision strengths by Zhang and Sampson (1992) and by Sampson, Goett and Clark (1984). Some line intensity ratios can be used for temperature diagnostics. We show 5 ratios in the UV region and 9 ratios in the x-ray region as a function of electron temperature and density at 0.3 keV ≲ Te ≲ 10 keV and ne = 1 – 1025 cm−3. The effect of cascade in these line ratios and in the level population densities are discused.