Observation of the 1S0 to 3D1 clock transition in 175Lu+
Abstract
We report the first laser spectroscopy of the 1S0 to 3D1 clock transition in 175Lu+. Clock operation is demonstrated on three pairs of Zeeman transitions, one pair from each hyperfine manifold of the 3D1 term. We measure the hyperfine intervals of the 3D1 to 10 ppb uncertainty and infer the optical frequency averaged over the three hyperfine transitions to be 353.639 915 952 2 (6) THz. The lifetime of the 3D1 state is inferred to be 174+23-32 hours from the M1 coupling strength.
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