Abstract
The 1s2s 3S−1s2p 3P J ( J = 0, 1, 2) transitions in helium-like ions can be used to test QED, but only if the other contributions to the transition energy, and especially the relativistic contributions are known to high accuracy. This work tests the relativistic calculations by comparing the theoretical 3P J splittings (which are nearly ndependent of QED) with each other and with experiment. An estimate of the largest uncalculated relativistic term, of relative order α 4 Z 4, is also made. It is found that the calculations of Hata and Grant are not very accurate, and that the small discrepancy between Drake and experiment vanishes if the α 4 Z 4 relativistic term is included.
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