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= 20


lower level   upper level      lambda(A)  Qd(1/s)   Ar(1/s)   Aa(1/s)  Branching-ratio

1s2p  3P 1.0  2p2p  1S  .0   	  3.0128  9.37E+09  6.65E+10  2.64E+13  3.55E-04
1s2s  3S 1.0  2s2p  1P 1.0   	  3.0197  2.03E+12  1.02E+12  2.01E+14  3.38E-03
1s2p  1P 1.0  2p2p  1S  .0   	  3.0268  2.27E+13  1.61E+14  2.64E+13  8.59E-01
1s2p  3P 1.0  2p2p  1D 2.0   	  3.0344  7.42E+10  2.37E+10  3.31E+14  4.49E-05
1s2s  1S  .0  2s2p  1P 1.0   	  3.0367  1.98E+14  9.87E+13  2.01E+14  3.29E-01
1s2p  3P 2.0  2p2p  1D 2.0   	  3.0377  5.31E+13  1.69E+13  3.31E+14  3.21E-02
1s2s  3S 1.0  2s2p  3P 2.0   	  3.0406  5.99E+13  9.81E+13  1.36E+13  8.78E-01
1s2p  3P 1.0  2p2p  3P 2.0   	  3.0422  4.75E+13  5.32E+13  4.27E+13  2.23E-01
1s2s  3S 1.0  2s2p  3P 1.0   	  3.0444  3.98E+13  9.67E+13  1.56E+13  8.54E-01
1s2p  3P 2.0  2p2p  3P 2.0   	  3.0455  1.16E+14  1.30E+14  4.27E+13  5.45E-01
1s2s  3S 1.0  2s2p  3P  .0   	  3.0459  1.20E+13  9.76E+13  1.36E+13  8.77E-01
1s2p  3P 1.0  2p2p  3P  .0   	  3.0467  1.79E+12  1.89E+14  1.82E+12  9.82E-01
1s2p  1P 1.0  2p2p  1D 2.0   	  3.0486  5.63E+14  1.80E+14  3.31E+14  3.40E-01
1s2p  1P 1.0  2p2p  3P 2.0   	  3.0564  1.14E+13  1.28E+13  4.27E+13  5.35E-02
1s2p  1P 1.0  2p2p  3P  .0   	  3.0610  1.61E+10  1.70E+12  1.82E+12  8.84E-03
1s2s  1S  .0  2s2p  3P 1.0   	  3.0617  4.06E+11  9.87E+11  1.56E+13  8.71E-03
1s2p  3P 1.0  2s2p  1S  .0   	  3.0654  5.55E+12  6.18E+12  3.33E+14  1.66E-02
1s2p  1P 1.0  2s2p  1S  .0   	  3.0799  2.84E+13  3.16E+13  3.33E+14  8.51E-02