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LNE-SYRTE CLOCK ENSEMBLE: NEW 87Rb HYPERFINE FREQUENCY MEASUREMENT - SPECTROSCOPY OF 199Hg AND 201Hg OPTICAL CLOCK TRANSITION
https://doi.org/10.1142/9789812838223_0008Cited by:1 (Source: Crossref)
Abstract:
This article describes recent frequency measurements performed with the LNE-SYRTE atomic clock ensemble. First, we report a new determination of the rubidium 87 hyperfine frequency, performed using Rb and Cs atomic fountains. The measurement has a statistical uncertainty below 10-16 and an overall uncertainty of 1.1 parts in 1015. Second, we report the first laser spectroscopy of the 1S0-3P0 optical clock transition at 265.6 nm in laser-cooled fermionic isotopes of neutral mercury. The absolute frequency is measured with a fractional uncertainty of ~ 5 parts in 1012 which improves upon previous indirect determinations by more than 4 orders of magnitude, an important step toward the realization of an optical lattice clock.
