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Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2023

12 CO 2 transition frequencies with kHz-accuracy by saturation spectroscopy in the 1.99–2.09 μm region

Résumé

Saturation spectroscopy has been used to determine the absolute frequencies of 107 ro-vibrational transitions of the two strongest 12CO2 bands of the 2 μm region. The considered 20012-00001 and 20013-00001 bands are of importance for the CO2 monitoring in our atmosphere. Lamb dips were measured using a cavity ring-down spectrometer linked to an optical frequency comb referenced to a GPS-disciplined Rb oscillator or to an ultra-stable optical frequency. The comb-coherence transfer (CCT) technique was applied to obtain a RF tunable narrow-line comb-disciplined laser source using an external cavity diode laser and a simple electro-optic modulator. This setup allows obtaining transition frequency measurements with kHz-level accuracy. The resulting accurate values of the energy levels of the 20012 and 20013 vibrational states are reproduced with a (1σ)-rms of about 1 kHz using the standard polynomial model. The two upper vibrational states appear thus to be highly isolated except for a local perturbation of the 20012 state leading to an energy shift of 15 kHz at J = 43. A recommended list of 145 transition frequencies with kHz accuracy is obtained providing secondary frequency standards across the 1.99–2.09 μm range. The reported frequencies will be valuable to constrain the zero-pressure frequencies of the considered transitions in 12CO2 retrieval from atmospheric spectra.
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Dates et versions

hal-04221903 , version 1 (16-11-2023)

Identifiants

Citer

H. Fleurbaey, P. Čermák, A. Campargue, S. Kassi, D. Romanini, et al.. 12 CO 2 transition frequencies with kHz-accuracy by saturation spectroscopy in the 1.99–2.09 μm region. Physical Chemistry Chemical Physics, 2023, 25 (24), pp.16319-16330. ⟨10.1039/d3cp01603j⟩. ⟨hal-04221903⟩

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