L.A. Vainshtein and U.I. Safronova 1978, ADNDT 21, 49 "Wavelengths and Transition Probabilities of Satellites to Resonance Lines of H- and He-like Ions" Table V He-like ion: Z= 18 lower level upper level lambda(A) Qd(1/s) Ar(1/s) Aa(1/s) Branching-ratio 1s2p 3P 1.0 2p2p 1S .0 3.7235 5.65E+09 3.04E+10 2.35E+13 2.41E-04 1s2s 3S 1.0 2s2p 1P 1.0 3.7324 8.50E+11 3.75E+11 2.02E+14 1.41E-03 1s2p 1P 1.0 2p2p 1S .0 3.7414 1.91E+13 1.03E+14 2.35E+13 8.14E-01 1s2p 3P 1.0 2p2p 1D 2.0 3.7537 5.39E+09 1.47E+09 3.50E+14 3.08E-06 1s2s 1S .0 2s2p 1P 1.0 3.7554 1.47E+14 6.47E+13 2.02E+14 2.43E-01 1s2p 3P 2.0 2p2p 1D 2.0 3.7568 2.28E+13 6.22E+12 3.50E+14 1.30E-02 1s2s 3S 1.0 2s2p 3P 2.0 3.7614 5.62E+13 6.38E+13 1.36E+13 8.24E-01 1s2p 3P 1.0 2p2p 3P 2.0 3.7637 2.66E+13 3.35E+13 2.41E+13 2.21E-01 1s2s 3S 1.0 2s2p 3P 1.0 3.7651 3.57E+13 6.33E+13 1.47E+13 8.07E-01 1s2s 3S 1.0 2s2p 3P .0 3.7666 1.12E+13 6.36E+13 1.36E+13 8.23E-01 1s2p 3P 2.0 2p2p 3P 2.0 3.7669 7.11E+13 8.95E+13 2.41E+13 5.90E-01 1s2p 3P 1.0 2p2p 3P .0 3.7684 1.17E+12 1.25E+14 1.19E+12 9.85E-01 1s2p 1P 1.0 2p2p 1D 2.0 3.7720 4.45E+14 1.22E+14 3.50E+14 2.55E-01 1s2p 1P 1.0 2p2p 3P 2.0 3.7821 3.68E+12 4.63E+12 2.41E+13 3.05E-02 1s2p 1P 1.0 2p2p 3P .0 3.7868 6.95E+09 7.39E+11 1.19E+12 5.83E-03 1s2s 1S .0 2s2p 3P 1.0 3.7885 2.05E+11 3.64E+11 1.47E+13 4.64E-03 1s2p 3P 1.0 2s2p 1S .0 3.7933 2.28E+12 2.45E+12 3.37E+14 6.76E-03 1s2p 1P 1.0 2s2p 1S .0 3.8120 2.10E+13 2.26E+13 3.37E+14 6.25E-02