The forbidden transitions within 3s
2 3p
5 3d of Fe ix and Ni xi and 3s
2 3p
4 3d of Fe x and Ni xii |
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| Authors: | B Edlén R Smitt |
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| Institution: | (1) Physics Department, University of Lund, 223 62 Lund, Sweden |
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| Abstract: | Improved level values for 3s
2 3p
5 3d and 3s
2 3p
4 3d of Fe ix and Fe x are derived from the observed forbidden lines with special regard to recent accurate measurements in the vacuum-ultraviolet part of the coronal spectrum. A procedure for estimating expected relative intensities is proposed and used for an additional check on the consistency of the identifications, which now comprise 12 lines of Fe IX and 11 lines of Fe x. Finally, by use of a suitable extrapolation technique the wavelengths of corresponding lines in nickel are predicted, which leads to some new identifications and a total of 6 identified lines of Ni xi and 4 of Ni xii. |
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