Observation of the ${}^1$S${}_0$ to ${}^3$D${}_1$ clock transition in ${}^{175}$Lu${}^{+}$

Abstract

We report the first laser spectroscopy of the ${}^1$S${}_0$ to ${}^3$D${}_1$ clock transition in ${}^{175}$Lu${}^{+}$. Clock operation is demonstrated on three pairs of Zeeman transitions, one pair from each hyperfine manifold of the ${}^3$D${}_1$ term. We measure the hyperfine intervals of the ${}^3$D${}_1$ 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 ${}^3$D${}_1$ state is inferred to be $174_{-32}^{+23}$ hours from the M1 coupling strength.

arXiv comment5 pages, 3 figures

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• Spectroscopy of the ${}^1{S}_0$-to-${}^1{D}_2$ clock transition in ${}^{176}$Lu${}^{+}$