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Spectroscopic experiment reveals an ultraprecise Landé g-factor for the 2D3/2 state in ytterbium-171 ions, highlighting improved accuracy for next-generation optical clocks.
In this work, we report a high-precision experimental determination of the ratio gF,D/gF,S=0.998060(5) between the Landé g-factors for states S1/22(F=1) and D3/22(F=1) in 171Yb+. Together with the recently calculated g-factor of the S1/22 state g(S1/2)=2.002615(70), this yields a value of g(D3/2)=0.79917(3) for D3/22 with a precision more than an order of magnitude higher than that of previous measurements. The experiment was performed by microwave spectroscopy of hyperfine transitions in the S1/22 and D3/22 manifolds of trapped ions confined in a linear Paul trap. We also obtain the hyperfine splitting WD3/2=857,178,077(3) Hz, agreeing with previous measurements. Precise knowledge of the D3/22 state Landé g-factor is essential for evaluating systematic shifts in 171Yb+ optical clocks and for tests of fundamental theories using such frequency standards.
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Galstyan et al. (2026) studied this question.
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