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arXiv:2512.04920 (physics)
[Submitted on 4 Dec 2025 (v1), last revised 5 Dec 2025 (this version, v2)]

Title:First observation and measurement of the ${}^{198}\text{Hg}$ bosonic transition in an optical lattice clock

Authors:Clara Zyskind, Thomas Lauprêtre, Haosen Shang, Benjamin Pointard, Rodolphe Le Targat, Jérôme Lodewyck, Sébastien Bize
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Abstract:We report the first observation of the magnetic-field-induced (5d10 6s2)1S0-(5d10 6s6p)3P0 transition in a bosonic isotope of mercury, 198Hg, realized in an optical lattice clock. We characterize this new isotope, determining key features such as the quadratic Zeeman shift, the probe light shift, and the magic frequency. We also report a first comparison between the 198Hg optical lattice clock and 87Sr. In this comparison, the 198Hg clock has a relative frequency stability of 6x10-16/sqrt(tau/s) and a total relative systematic uncertainty of 6.9x10-16. This comparison yields the first direct determination of the 198Hg/87Sr optical frequency ratio: 198Hg/87Sr = 2.629 315 734 684 118 1, with the same relative uncertainty.
Subjects: Atomic Physics (physics.atom-ph)
Cite as: arXiv:2512.04920 [physics.atom-ph]
  (or arXiv:2512.04920v2 [physics.atom-ph] for this version)
  https://doi.org/10.48550/arXiv.2512.04920

Submission history

From: Clara Zyskind [view email]
[v1] Thu, 4 Dec 2025 15:50:04 UTC (1,434 KB)
[v2] Fri, 5 Dec 2025 07:43:22 UTC (1,434 KB)
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