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The wavelengths of three transitions in Fe XXIV and one transition in Fe XXIII of the type n = 4 to 2 have been accurately measured in solar flare spectra. The measured wavelengths are compared with previous measurements and with ab initio and semi-empirical calculations that include screening parameters in the nonrelativistic, relativistic, and radiative terms.
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Seely et al. (1986) studied this question.
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