Table 1
Transition energy differences ΔE (eV), transition rates Aji (s-1), and effective collision strengths Υ for transitions j−i of He-like ions with Z = 20−42.
| Υ /Te | ||||||||||||||||||
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| Z | i | Level | j | Level | ΔE | A ji | 103 | 2 × 103 | 5 × 103 | 104 | 2 × 104 | 5 × 104 | 105 | 2 × 105 | 5 × 105 | 106 | 2 × 106 | |
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| . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| 26 | 1 | 11S0 | 2 | 23S1 | 6.6365 + 03 | 2.08 + 08 | 1.03–03 | 8.01–04 | 6.48–04 | 5.69–04 | 4.80–04 | 3.56–04 | 2.69–04 | 1.91–04 | 1.14–04 | 8.14–05 | 6.80–05 | |
| 26 | 1 | 11S0 | 3 | 23P0 | 6.6655 + 03 | ... | 2.44–04 | 2.46–04 | 2.54–04 | 2.45–04 | 2.20–04 | 1.70–04 | 1.29–04 | 8.96–05 | 5.09–05 | 3.40–05 | 2.64–05 | |
| 26 | 1 | 11S0 | 4 | 23P1 | 6.6675 + 03 | 4.44 + 13 | 9.23–04 | 9.07–04 | 9.22–04 | 9.09–04 | 8.63–04 | 7.97–04 | 7.83–04 | 8.37–04 | 1.08–03 | 1.48–03 | 2.30–03 | |
| 26 | 1 | 11S0 | 5 | 21S0 | 6.6679 + 03 | ... | 8.52–04 | 8.70–04 | 9.09–04 | 9.32–04 | 9.53–04 | 1.01–03 | 1.08–03 | 1.19–03 | 1.38–03 | 1.60–03 | 2.01–03 | |
| 26 | 1 | 11S0 | 6 | 23P2 | 6.6822 + 03 | 6.51 + 09 | 1.10–03 | 1.14–03 | 1.20–03 | 1.17–03 | 1.05–03 | 8.07–04 | 6.06–04 | 4.19–04 | 2.36–04 | 1.57–04 | 1.21–04 | |
| 26 | 1 | 11S0 | 7 | 21P1 | 6.7003 + 03 | 4.56 + 14 | 2.27–03 | 2.34–03 | 2.48–03 | 2.64–03 | 2.91–03 | 3.66–03 | 4.75–03 | 6.51–03 | 1.04–02 | 1.54–02 | 2.47–02 | |
| 26 | 1 | 11S0 | 8 | 33S1 | 7.8632 + 03 | 9.13 + 07 | 1.36–04 | 1.49–04 | 1.43–04 | 1.27–04 | 1.08–04 | 8.40–05 | 6.59–05 | 4.81–05 | 2.95–05 | 2.13–05 | 1.81–05 | |
| 26 | 1 | 11S0 | 9 | 33P0 | 7.8712 + 03 | ... | 6.92–05 | 7.26–05 | 7.06–05 | 6.49–05 | 5.71–05 | 4.47–05 | 3.42–05 | 2.40–05 | 1.38–05 | 9.36–06 | 7.36–06 | |
| 26 | 1 | 11S0 | 10 | 31S0 | 7.8715 + 03 | ... | 1.75–04 | 1.83–04 | 1.85–04 | 1.84–04 | 1.86–04 | 1.98–04 | 2.16–04 | 2.41–04 | 2.86–04 | 3.36–04 | 4.27–04 | |
| . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
Notes. Electron temperatures Te are in units of (Z−1)2 K. Transition rate Aji stands for sum of E1, M1, E2, and M2 transition rates for transition j → i. The notations are n1,3LJ ≡ 1snl1,3LJ; a ± b ≡ a × 10± b. (The full table is available at the CDS.)
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