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Excitation of Ar15+ and Fe23+ for diagnostic application to fusion and astrophysical plasmas

Electron-impact excitation collision strengths for transitions among doubly excited levels up to the n = 3 shell (excluding the 1s 3l3l' configurations) of lithium-like argon and iron have been calculated using a radiation- and Auger-damped, intermediate-coupling frame transformation, R-matrix approach. Collision strengths have also been calculated for transitions between all singly excited levels up to the n = 5 shell for the same systems. The Maxwell-averaged effective collision strengths are estimated to be accurate to within 20% at temperatures 5 × 104–5 × 108 K for Ar15+ and 105–109 K for Fe23+. These results are of substantially improved precision compared to previous studies. The data relate to the analysis of soft x-ray helium-like spectra in both astrophysical and fusion thermal plasmas. We summarize the sensitivity to the new data of the spectral simulations which are matched to experiment in current spectral analysis procedures. Also, we present some brief results of modelling using the presented data.