Radium Ion Optical Clock.

@article{Holliman2022RadiumIO,
  title={Radium Ion Optical Clock.},
  author={Craig A. Holliman and M. Fan and A Q Contractor and Samuel M. Brewer and Andrew M. Jayich},
  journal={Physical review letters},
  year={2022},
  volume={128 3},
  pages={
          033202
        }
}
We report the first operation of a Ra^{+} optical clock, a promising high-performance clock candidate. The clock uses a single trapped ^{226}Ra^{+} ion and operates on the 7s ^{2}S_{1/2}→6d ^{2}D_{5/2} electric quadrupole transition. By self-referencing three pairs of symmetric Zeeman transitions, we demonstrate a frequency instability of 1.1×10^{-13}/sqrt[τ], where τ is the averaging time in seconds. The total systematic uncertainty is evaluated to be Δν/ν=9×10^{-16}. Using the clock, we… 

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