Metrology of methanol in the near-infrared at the 10^-13 level
(2025) Belgian Physical Society 2025 — Location: Louvain-la-Neuve, Belgium (28.May.2025)
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Poster
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- Authors
Ubachs, Wim 
- et. al.
- Abstract
- This poster showcases the application of Noise-Immune Cavity-Enhanced Optical Heterodyne Molecular Spectroscopy (NICE-OHMS) for precision spectroscopy of methanol. This approach, invented almost thirty years ago [1] and further developed as an optical precision tool [2], allows the measurement as Lamb-dips of extremely weak transitions [3], combining both sensitivity and accuracy. We report sub-kHz precision measurements of three vibrational line pairs, corresponding to the 3−1E - 20E combination difference in the vibrationless ground state. This allows the determination of this 12.2 GHz radio line frequency, highly sensitive to potential variations in the proton-electron mass ratios [4, 5], at kHz precision. Furthermore, having moved our NICEOHMS setup, we present a comparison of results obtained in Amsterdam and Louvain-la-Neuve on these very accurate frequency determination of methanol resonances.
- Affiliations
Citations
Altman, A., Cozijn, F., Bogomolov, A., Libert, A., Ubachs, W., & et al. (2025). Metrology of methanol in the near-infrared at the 10^-13 level. Belgian Physical Society 2025, Louvain-la-Neuve, Belgium.