Spectroscopy of methanol in the near-infrared at the 10^−13 level.
(2025) METAMORPHOSE — Location: Louvain-la-Neuve, Belgium (22.May.2025)
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- Abstract
- This presentation 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 and further developed as an optical precision tool, allows the measurement as Lamb-dips of extremely weak transitions, 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, at kHz precision. Furthermore, having moved our NICEOHMS setup, I will end this talk by presenting a comparison of results obtained in Amsterdam and Louvain-la-Neuve on these very accurate frequency determination of methanol resonances.
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Citations
Altman, A., Cozijn, F., Bogomolov, A., Libert, A., & Ubachs, W. (2025). Spectroscopy of methanol in the near-infrared at the 10^−13 level. METAMORPHOSE, Louvain-la-Neuve, Belgium. https://hdl.handle.net/2078.5/269676