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= 26 lower level upper level lambda(A) Qd(1/s) Ar(1/s) Aa(1/s) Branching-ratio 1s2p 3P 1.0 2p2p 1S .0 1.7746 1.75E+10 2.44E+11 3.88E+13 4.51E-04 1s2s 3S 1.0 2s2p 1P 1.0 1.7791 1.31E+13 1.08E+13 1.96E+14 2.23E-02 1s2p 1P 1.0 2p2p 1S .0 1.7830 3.60E+13 5.02E+14 3.88E+13 9.28E-01 1s2p 3P 1.0 2p2p 1D 2.0 1.7835 9.74E+11 6.37E+11 2.53E+14 7.71E-04 1s2s 1S .0 2s2p 1P 1.0 1.7872 3.37E+14 2.79E+14 1.96E+14 5.75E-01 1s2p 3P 2.0 2p2p 1D 2.0 1.7873 2.14E+14 1.40E+14 2.53E+14 1.69E-01 1s2s 3S 1.0 2s2p 3P 2.0 1.7881 6.51E+13 2.87E+14 1.36E+13 9.55E-01 1s2p 3P 1.0 2p2p 3P 2.0 1.7888 1.57E+14 1.79E+14 1.21E+14 2.59E-01 1s2p 1P 1.0 2p2p 1D 2.0 1.7920 6.62E+14 4.33E+14 2.53E+14 5.24E-01 1s2s 3S 1.0 2s2p 3P 1.0 1.7922 5.57E+13 2.74E+14 2.07E+13 8.98E-01 1s2p 3P 2.0 2p2p 3P 2.0 1.7926 2.53E+14 2.89E+14 1.21E+14 4.17E-01 1s2p 3P 1.0 2p2p 3P .0 1.7931 3.51E+12 5.19E+14 3.59E+12 9.77E-01 1s2s 3S 1.0 2s2p 3P .0 1.7934 1.30E+13 2.84E+14 1.36E+13 9.54E-01 1s2p 1P 1.0 2p2p 3P 2.0 1.7973 9.01E+13 1.03E+14 1.21E+14 1.49E-01 1s2s 1S .0 2s2p 3P 1.0 1.8004 2.14E+12 1.06E+13 2.07E+13 3.46E-02 1s2p 1P 1.0 2p2p 3P .0 1.8016 5.92E+10 8.77E+12 3.59E+12 1.65E-02 1s2p 3P 1.0 2p2p 1S .0 1.8024 3.66E+13 4.90E+13 3.19E+14 1.15E-01 1s2p 1P 1.0 2p2p 1S .0 1.8110 4.41E+13 5.90E+13 3.19E+14 1.38E-01