NEW CALCULATIONS OF FE L-SHELL X-RAY-SPECTRA IN HIGH-TEMPERATURE PLASMAS

The predictions of the standard plasma emission codes are inconsistent with spectroscopic data acquired during the ASCA performance verifica tion phase. The discrepancies are evident in the 0.7-1.5 keV spectral range, the domain of n --> 2 (L-shell) transitions in highly ionized F e species. We have recalculated Fe L-shell spectra using the HULLAC at omic physics package and find that an update of the Fe data used in th e current generation of emission line codes is warranted. We present h ere a synopsis of our results for the charge states Fe XXIII and Fe XX IV. These results are relevant to the interpretation of spectroscopic data from stellar coronae, supernova remnants, and galaxy clusters.