We report on precision spectroscopy of the 6s² ¹S₀→6s6p ³P₁ intercombination line of mercury in the deep ultraviolet, by means of a frequency-comb referenced, wavelength-modulated, saturated absorption technique. This method allowed us to perform sub-Doppler investigations with an absolute frequency axis at 254 nm, while ensuring a relatively high signal-to-noise ratio. The absolute line center frequencies of the ²⁰⁰Hg and ²⁰²Hg bosonic isotopes were measured with a global uncertainty of 8 and 15 kHz (namely, 6.8×10⁻¹² and 1.3×10⁻¹¹, in relative terms), respectively, the statistical and systematic components being significantly reduced as compared to past determinations. This remarkable result was achieved also thanks to an in-depth study of the AC stark effect. Furthermore, we found the most accurate ²⁰⁰Hg-²⁰²Hg isotope shift ever obtained before, namely, 5295570±15ₛₜₐₜ±8syst kHz.
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Gravina et al. (2024) studied this question.
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