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= 28 lower level upper level lambda(A) Qd(1/s) Ar(1/s) Aa(1/s) Branching-ratio 1s2p 3P 1.0 2p2p 1S .0 1.5271 1.64E+10 2.76E+11 4.37E+13 3.74E-04 1s2s 3S 1.0 2s2p 1P 1.0 1.5314 2.00E+13 2.02E+13 1.93E+14 3.45E-02 1s2p 3P 1.0 2p2p 1D 2.0 1.5339 1.11E+12 9.71E+11 2.29E+14 9.65E-04 1s2p 1P 1.0 2p2p 1S .0 1.5346 4.11E+13 6.95E+14 4.37E+13 9.40E-01 1s2p 3P 2.0 2p2p 1D 2.0 1.5378 2.57E+14 2.26E+14 2.29E+14 2.24E-01 1s2s 1S .0 2s2p 1P 1.0 1.5379 3.68E+14 3.72E+14 1.93E+14 6.36E-01 1s2s 3S 1.0 2s2p 3P 2.0 1.5384 6.59E+13 3.88E+14 1.36E+13 9.66E-01 1s2p 3P 1.0 2p2p 3P 2.0 1.5390 2.02E+14 2.57E+14 1.44E+14 2.80E-01 1s2p 1P 1.0 2p2p 1D 2.0 1.5415 6.27E+14 5.51E+14 2.29E+14 5.47E-01 1s2s 3S 1.0 2s2p 3P 1.0 1.5426 6.26E+13 3.66E+14 2.33E+13 8.95E-01 1s2p 3P 2.0 2p2p 3P 2.0 1.5430 2.79E+14 3.55E+14 1.44E+14 3.87E-01 1s2p 3P 1.0 2p2p 3P .0 1.5433 3.78E+12 6.87E+14 3.86E+12 9.77E-01 1s2s 3S 1.0 2s2p 3P .0 1.5437 1.32E+13 3.84E+14 1.36E+13 9.66E-01 1s2p 1P 1.0 2p2p 3P 2.0 1.5467 1.27E+14 1.62E+14 1.44E+14 1.76E-01 1s2s 1S .0 2s2p 3P 1.0 1.5492 3.37E+12 1.97E+13 2.33E+13 4.82E-02 1s2p 3P 1.0 2s2p 1S .0 1.5510 5.56E+13 8.18E+13 3.14E+14 1.77E-01 1s2p 1P 1.0 2p2p 3P .0 1.5510 6.59E+10 1.20E+13 3.86E+12 1.70E-02 1s2p 1P 1.0 2p2p 1S .0 1.5587 4.47E+13 6.56E+13 3.14E+14 1.42E-01