Abstract
For almost half a century, the triplet states of helium have been investigated both theoretically and experimentally by atomic physicists. From the early calculations by Heisenberg1 to the present, the determination of the 23P fine structure splittings have demonstrated the validity of the theory of the interaction of electrons with the electromagnetic field. If one assumes that quantum electrodynamics properly describes the electron-electron interaction in helium, one can use the measured fine structure intervals and the calculated values to precisely determine the fine structure constant α.
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