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Table 3

Lifetimes (in s) for the nine lowest excited states of F-like ions with Z = 20−30.

2s2 2p5 2s 2p6
2P1∕2 2S1∕2 4P5∕2 4P3∕2 4P1∕2 2P3∕2 2P1∕2 2D5∕2 2D3∕2
Ca XII τ 2.045E−03 1.481E−11 1.788E−10 5.586E−12 9.550E−11 2.162E−12 1.547E−12 4.054E−12 3.818E−12
2.099E−03 1.515E−11 1.682E−10 6.238E−12 9.743E−11 1.868E−12 1.424E−12 3.658E−12 3.450E−12
Sc XIII τ 1.021E−03 1.350E−11 1.048E−10 3.289E−12 6.707E−11 1.893E−12 1.186E−12 3.118E−12 2.879E−12
1.046E−03 1.347E−11 9.809E−11 3.481E−12 6.605E−11 1.609E−12 1.085E−12 2.818E−12 2.605E−12
Ti XIV τ 5.288E−04 1.234E−11 6.405E−11 2.104E−12 4.770E−11 1.709E−12 9.265E−13 2.444E−12 2.207E−12
5.391E−04 1.253E−11 6.046E−11 2.169E−12 4.590E−11 1.481E−12 8.642E−13 2.235E−12 2.022E−12
2P1∕2 2S1∕2 4P5∕2 2P3∕2 4P1∕2 4P3∕2 2P1∕2 2D5∕2 2D3∕2
V XV τ 2.834E−04 1.130E−11 4.071E−11 1.446E−12 3.219E−11 1.571E−12 7.366E−13 1.947E−12 1.716E−12
2.882E−04 1.145E−11 3.848E−11 1.451E−12 3.036E−11 1.373E−12 6.905E−13 1.790E−12 1.581E−12
Cr XVI τ 1.565E−04 1.036E−11 2.682E−11 1.051E−12 1.939E−11 1.452E−12 5.964E−13 1.575E−12 1.352E−12
1.56E−04 1.14E−11 2.51E−11 1.02E−12 1.94E−11 1.35E−12 5.68E−13 1.51E−12 1.28E−12
Mn XVII τ 8.884E−05 9.508E−12 1.825E−11 7.973E−13 1.057E−11 1.340E−12 4.927E−13 1.290E−12 1.078E−12
8.87E−05 1.04E−11 1.71E−11 7.73E−13 1.06E−11 1.26E−12 4.70E−13 1.24E−12 1.02E−12
Fe XVIII τ 5.171E−05 8.731E−12 1.279E−11 6.245E−13 5.664E−12 1.232E−12 4.155E−13 1.068E−12 8.687E−13
5.16E−05 9.45E−12 1.20E−11 6.04E−13 5.71E−12 1.16E−12 3.97E−13 1.03E−12 8.25E−13
Co XIV τ 3.079E−05 8.019E−12 9.213E−12 5.013E−13 3.213E−12 1.127E−12 3.573E−13 8.935E−13 7.075E−13
3.07E−05 8.64E−12 8.70E−12 4.84E−13 3.22E−12 1.07E−12 3.41E−13 8.60E−13 6.73E−13
Ni XX τ 1.872E−05 7.365E−12 6.800E−12 4.102E−13 1.988E−12 1.026E−12 3.115E−13 7.538E−13 5.817E−13
1.87E−05 7.90E−12 6.43E−12 3.95E−13 1.98E−12 9.78E−13 2.98E−13 7.27E−13 5.54E−13
Cu XXI τ 1.161E−05 6.762E−12 5.131E−12 3.407E−13 1.337E−12 9.301E−13 2.740E−13 6.408E−13 4.826E−13
1.16E−05 7.22E−12 4.86E−12 3.28E−13 1.32E−12 8.90E−13 2.62E−13 6.19E−13 4.60E−13
Zn XXII τ 7.324E−06 6.205E−12 3.951E−12 2.866E−13 9.637E−13 8.405E−13 2.418E−13 5.483E−13 4.038E−13
7.31E−06 6.60E−12 3.75E−12 2.76E−13 9.46E−13 8.07E−13 2.31E−13 5.30E−13 3.85E−13

Notes. This table compares the present Emu CI lifetimes, τ, with the values from (a) Aggarwal (2019), (b) El-Sayed & Attia (2019), and (c) Si et al. (2016).

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