Comb-Referenced Doppler-Free Spectrometry of the 200Hg and 202Hg Intercombination Line at 254 nm
Year: 2024
Authors: Gravina S., Chishti N.A., Di Bernardo S., Fasci E., Castrillo A., Laliotis A., Gianfrani L.
Autors Affiliation: Univ Campania Luigi Vanvitelli, Dipartimento Matemat & Fis, I-81100 Caserta, Italy; Univ Sorbonne Paris Nord, Lab Phys Lasers, F-93430 Villetaneuse, France.
Abstract: 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 x 10-12 and 1.3 x 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, 5 295 57 0 +/- 15stat +/- 8syst kHz.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 132 (21) Pages from: 213001-1 to: 213001-6
More Information: This research was partially funded by Universita degli Studi della Campania Luigi Vanvitelli under the program Progetto Giovani, Call 2022.KeyWords: Isotope Shift; FrequencyDOI: 10.1103/PhysRevLett.132.213001
