Wavelengths for the 2s²2p⁵3s-2s²2p⁶3p transitions in the neonlike isoelectronic sequence have been calculated by means of the relativistic code of Grant et al. [Comput. Phys. Commun. 21, 207 (1980)]. Mixing with the 2s2p⁶3l configurations is found to be important. A separate optimization for the 2p⁵3p ¹{S}₀$ state is needed. Comparisons with observations in Ti xiii, Fe xvii, Se xxv, and Y xxx show excellent agreement.
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Cogordan et al. (1985) studied this question.