Relativistic calculation of3s-3ptransition wavelengths in neonlike ions

Abstract

Wavelengths for the 2$s^2$2$p^5$3s-2$s^2$2$p^6$3p transitions in the neonlike isoelectronic sequence have been calculated by means of the relativistic code of Grant et al. [Comput. Phys. Commun. 21, 207 (1980)]. Mixing with the 2s2$p^6$3l configurations is found to be important. A separate optimization for the 2$p^5$3p ${}^1$ $S_0$ state is needed. Comparisons with observations in Ti xiii, Fe xvii, Se xxv, and Y xxx show excellent agreement.