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Theses

Spectroscopie ultraviolet-visible et infrarouge de molécules clés atmosphériques

Abstract : Optical measurements of atmospheric minor constituents are carried using spectrometers working in different spectral ranges by ground, air or satellite instruments. However, the analysis and interpretation of the corresponding atmospheric spectra require good knowledge of the spectroscopic parameters. Moreover, spectroscopic measurements in laboratory are generally performed in a spectral region (IR or UV) and little of laboratory study has ever verified the consistency between the cross-sections in UV and IR. It is then difficult to compare atmospheric profiles measured in different regions. Consequently, the aim of the study was to intercalibrate spectra in the infrared and ultraviolet regions, by determining and/or checking the coherence of the cross section published in the literature. The experiments were performed at LISA by acquiring simultaneously UV and IR spectra at room temperature and atmospheric pressure using a common optical cell. This work relates to three atmospheric key species : formaldehyde (and its isotopes), ozone and nitrous acid. These compounds play a fundamental role in atmospheric physico-chemistry since they constitute the sources of the principal oxidant of the atmosphere: the hydroxyl radical. This laboratory work enables to have precise and coherent spectra of ozone, formaldehyde and nitrous acid in the mid-infrared and UV-visible regions in order to improve the precision of their measurements.
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  • HAL Id : tel-00846616, version 1

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Aline Gratien. Spectroscopie ultraviolet-visible et infrarouge de molécules clés atmosphériques. Sciences de la Terre. Université Paris-Est, 2008. Français. ⟨NNT : 2008PEST0038⟩. ⟨tel-00846616⟩

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