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arXiv · 2207.10215

Rotational spectroscopy of a single molecular ion at sub part-per-trillion resolution

Alejandra L. Collopy·Julian Schmidt·Dietrich Leibfried·David R. Leibrandt·Chin-Wen Chou
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Abstract

We use quantum-logic spectroscopy (QLS) and interrogate rotational transitions of a single CaH+ ion with a highly coherent frequency comb, achieving a fractional statistical uncertainty for a transition line center of 4 x 10^-13. We also improve the resolution in measurement of the Stark effect due to the radio-frequency (rf) electric field experienced by a molecular ion in an rf Paul trap, which we characterize and model. This allows us to determine the electric dipole moment of CaH+ by systematically displacing the ion to sample different known rf electric fields and measuring the resultant shifts in transition frequency.

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Alejandra L. Collopy, Julian Schmidt, Dietrich Leibfried, David R. Leibrandt, Chin-Wen Chou. 2022-07-20. Rotational spectroscopy of a single molecular ion at sub part-per-trillion resolution. https://doi.org/10.1103/physrevlett.130.223201

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