Relativistic multireference many-body perturbation theory is generalized to calculate the energies of highly excited levels in multivalence-electron ions of iron group elements responsible for soft-x-ray emission lines. Term energies of the highly excited $n=4$ states arising from the 3s²3p4l0.3em0ex(l=0--3) and 3s3p²4l0.3em0ex(l=0--3) configurations in Fe0.3em0exXIII are computed to high accuracy. Theoretical electric dipole transition probabilities and wavelengths of the transitions to low-lying $n=3$ levels are compared with solar and laboratory lines to identify hitherto unidentified and∕or poorly characterized extreme ultraviolet and soft-x-ray spectral lines. $E1$, $E2$, and $M1$ decay rates and lifetimes of lower excited levels of the $n=3$ manifold are evaluated as a benchmark for future experiments.
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Vilkas et al. (2004) studied this question.