Lines of the 3 d 9 4 s -3 d 9 4 p transitions in nickel-like Zr XIII, Nb XIV and Mo XV have been identified in the 340-500 Å region in spectra emitted from laserproduced plasmas. All levels of the 3 d 9 4 s and 3 d 9 4 p configurations have been established from the observations. Comparisons with predictions of Wyart and Ryabtsev show a good agreement. The structure has been studied by means of MCDF calculations along the isoelectronic sequence up to Xe XXVII. Tentative identifications are given for the strongest lines of the 3 d 9 4 p -3 d 9 4 d transition in Zr XIII and Nb XIV.
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Brage et al. (1987) studied this question.
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