Comb-referenced Doppler-free spectrometry of the 200Hg and 202Hg intercombination line at 254 nm
Abstract
We report on precision spectroscopy of the 6s2 1S06s6p 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, 529557015stat8syst kHz.
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