Abstract
The levels of the configuration 3s 23 p 53d of Fe ix have been experimentally determined from their combinations with 3s3 p 63d 3 D in the region 300–400 Å. Wavelengths can now be accurately predicted for all transitions within 3s 23 p 53d, and eight of these can be identified with coronal lines from 2042 to 4585 Å. Also, identifications of solar lines from 171 to 245 Å with electric-dipole and magnetic-quadrupole transitions to the ground state, 3s 23p 6 1 S, are confirmed and extended. Solar identifications with corresponding transitions in Ni xi, both within 3s 23 p 53d and to the ground state, are proposed on the basis of a short extrapolation.
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Svensson, L.Å., Ekberg, J.O. & Edlén, B. The identification of Feix and Nixi in the solar corona. Sol Phys 34, 173–179 (1974). https://doi.org/10.1007/BF00149608
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DOI: https://doi.org/10.1007/BF00149608