Radiative rates for E1, E2, M1, and M2 transitions in F-like ions with55≤Z≤73

Abstract

Energy levels, radiative rates and lifetimes are reported for 19 F-like ions with 55 ≤ Z ≤ 73, among 113 levels of the 2s 2 2p 5 , 2s2p 6 , 2s 2 2p 4 3ℓ, 2s2p 5 3ℓ, and 2p 6 3ℓ configurations. The general-purpose relativistic atomic structure package (grasp) has been adopted for the calculations, and radiative rates (and other associated parameters, such as oscillator strengths and line strengths) are listed for all E1, E2, M1, and M2 transitions of the ions. Comparisons are made with earlier available theoretical and experimental energies, especially for Ba XLVIII. Nevertheless, calculations have also been performed with the flexible atomic code (fac), and with a much larger configuration interaction with up to 38 089 levels, for further accuracy assessments, particularly for energy levels.

Energy Levels and Radiative Rates for Transitions in F-like Sc XIII and Ne-like Sc XII and Y XXX

“…Therefore, in this work, we cover a much wider range of levels, discussed in Section 2. We also note here that similar data for F-like Y XXXI are not considered here because results have already been reported in a separate paper [4].…”

“…However, such comparisons are very limited and hence cannot be confidently relied upon. In conclusion, on the basis of the (whatever possible) comparisons have been made for all three ions, our experience on a wide range of other ions, including F-like [4,13] and Ne-like [14,15], and considering that we have included a large CI as well as relativistic effects in generating wavefunctions, we assess the accuracy of our radiative rates to be about 20%, for a majority of strong transitions with f ≥ 0.1. …”

“…These levels mostly belong to the 2s 2 2p 5 , 2s2p 6 , 2s 2 2p 4 3 , and 2s2p 5 3 configurations, and beyond these from others intermix, such as 2s 2 2p 4 4 . However, energies for higher levels can be obtained from the author on request.…”

“…With GRASP, we have performed a series of calculations with increasing CI, but mention here only three, namely (i) GRASP1, which includes 113 levels of the 2s 2 2p 5 , 2s2p 6 , 2s 2 2p 4 3 , 2s2p 5 3 , and 2p 6 3 (11) configurations; (ii) GRASP2, which includes a further eight of 2s 2 2p 4 4 and 2s2p 5 4 , giving rise to additional 159 levels; and finally (iii) GRASP3, which includes 501 levels in total from 38 configurations, the additional ones being 2p 6 4 , 2s 2 2p 4 5 , 2s2p 5 5 , and 2p 6 5 . However, for brevity, we will discuss results from only our final calculations, but the effect of additional CI will be discussed with those from FAC.…”

“…As in our earlier work on several F-like [4,13] and Ne-like [14,15] ions, we adopt the fully relativistic GRASP (general-purpose relativistic atomic structure package) code of Grant et al [16] to determine the atomic structure, and subsequently to calculate energy levels and A-values. However, this earlier version has been significantly revised by Dr. P.H.…”