| Reference Label | Details |
|---|---|
| est unc | estimated uncertainty |
| Nicolaides 1981 | C. A. Nicolaides, Y. Komninos, and D. R. Beck, Phys. Rev. A 24, 1103-1106 (1981) Bound States and Decay Mechanisms of He- |
| Tech 1971 | J. L. Tech and J. F. Ward, Phys. Rev. Lett. 27, 367 (1971) Accurate Wavelength Measurement of the 1s2p 3P° - 2p2 3P Transition in 4He |