Relativistic distorted-wave calculations of electron collision cross sections and rate coefficients for Ne-like ions

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

“…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.…”

“…Our final calculations with GRASP include 3948 levels from 64 configurations, namely 2s 2 2p 6 , 2s 2 2p 5 3 , 2s2p 6 3 , 2s 2 2p 5 4 , 2s2p 6 4 , 2s 2 2p 5 5 , 2s2p 6 5 , 2s 2 2p 5 6s/p/d, 2s 2 2p 5 7s/p/d, (2s 2 2p 4 ) 3s3p, 3s3d, 3p3d, 3s 2 , 3p 2 , 3d 2 , 3s4 , 3s5 , 3p4 , 3p5 , 3d4 , and 3d5 . Similarly, with FAC, we have performed mainly three sets of calculations, which are: (i) FAC1, which includes 3948 levels of the same configurations as in GRASP, (ii) FAC2, which includes 17 729 levels arising from all possible combinations of 2*8, (2*7) 3*1, 4*1, 5*1, 6*1, 7*1, (2*6) 3*2, 3*1 4*1, 3*1 5*1, 3*1 6*1, and 3*1 7*1, and finally (iii) FAC3, which includes a total of 93,437 levels, the additional ones arising from (2*6) 4*1 5*1, 4*1 6*1, 4*1 7*1, 5*1 6*1, 5*1 7*1, 6*1 7*1, and 2*5 3*3.…”

“…Ne-like ions are of interest for the studies of astrophysical, lasing and fusion plasmas, and therefore many workers, such as [5][6][7][8][9][10], have reported data for a wide range of ions. However, for brevity, many of them have not reported data for Sc XII, although Hibbert et al [9] have listed lifetimes (τ) for the lowest 27 levels of the 2s 2 2p 6 and 2s 2 2p 5 3 configurations.…”

“…Similarly, energy levels and radiative rates (A-values) have been determined for several ions of the F sequence of which the work by Jönsson et al [3] is not only the latest, but also the most accurate because differences with the measurements are minimal for the energy levels. Unfortunately, they calculated data only for the lowest three levels of the 2s 2 2p 5 and 2s2p 6 configurations, which are not sufficient for modelling of plasmas because the data are required for a wider range of levels. Therefore, in this work, we cover a much wider range of levels, discussed in Section 2.…”