Abstract
The orbital relaxation effect was studied in the calculations and diagnostics of the L-shell absorption spectra ( 2 p → 3 d , 4 d , 5 d ) of iron and bromine plasmas. A detailed level accounting model was developed to calculate the huge number of L-shell absorption lines of the two typical mid-Z plasmas. The orbital sets were generated by the optimizations according to the initial and final states, respectively. It was found that the L-shell line positions agree with the experimental iron and bromine spectra better when the orbital relaxations were included in calculations. Since experimental mid-Z spectra have few detailed line structures, calculations without considering orbital relaxations may misinterpret the spectra and consequently lead to underestimations of the plasma temperatures.
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