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Abstract:
The g factor of lithiumlike silicon 28Si11+ has been measured in a triple-Penning trap with a relative uncertainty of 1.1×10-9 to be gexp=2.000 889 889 9(21). The theoretical prediction for this value was calculated to be gth=2.000 889 909(51) improving the accuracy to 2.5×10-8 due to the first rigorous evaluation of the two-photon exchange correction. The measured value is in excellent agreement with the theoretical prediction and yields the most stringent test of bound-state QED for the g factor of the 1s22s state and the relativistic many-electron calculations in a magnetic field.
