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Accurate modeling of the diagnostic 118-GHz oxygen line for remote sensing of the atmosphere

Abstract : We report the results of laboratory investigations of the shape of the diagnostic atmospheric N = 1- oxygen line performed over a very wide range of pressures from 0.4 to 1000 Torr using two principally different spectrometers having complementary abilities. A spectrometer with a radio-acoustic detector of absorption was used for recording low pressure spectra spanning the 0.4-2 Torr range, and high pressure data from 250 to 1000 Torr were registered by a resonator spectrometer. The sensitivity of both instruments was improved significantly which allowed us to obtain signal-to-noise ratio at spectra recordings of the order of a few thousands. The spectra analysis enabled the first manifestation of the speed-dependence of the collision cross section of the line, along with considerable refinement of other parameters, including pressure broadening, intensity and line-mixing. The results are of primary importance for atmospheric applications.
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https://hal-insu.archives-ouvertes.fr/insu-03727058
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Submitted on : Tuesday, July 19, 2022 - 8:35:10 AM
Last modification on : Tuesday, August 2, 2022 - 4:32:49 AM

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M. A. Koshelev, T. Delahaye, E. A. Serov, I. N. Vilkov, C. Boulet, et al.. Accurate modeling of the diagnostic 118-GHz oxygen line for remote sensing of the atmosphere. Journal of Quantitative Spectroscopy and Radiative Transfer, 2017, 196, pp.78-86. ⟨10.1016/j.jqsrt.2017.03.043⟩. ⟨insu-03727058⟩

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