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Composition chimique du brouillard de Titan par mobilité ionique couplée à la spectrométrie de masse haute résolution

Abstract : Although the prebiotic challenge is important, the study of aerosols in the atmosphere of Titan, Saturn's largest moon, remains a challenge for the scientific community. Indeed, the data collected by the Voyager and Cassini-Huygens probes made it possible to retrieve the first information but not to unlock the secrets of this particle fog. The purpose of this thesis is to study the chemical composition of these aerosols through their reproduction on Earth. The first approach presented is molecular characterization using high resolution mass spectrometry. In this section, the comparison between the soluble and insoluble fraction of these samples and their ageing will be presented. Then, the investigation of the growth of these aerosols is presented through the use of tandem mass spectrometry. The last part of this thesis presents the study of the three-dimensional structure. For this purpose, ion mobility coupled with mass spectrometry has been used and will be reported in two parts, one in TWIMS-Synapt and the other in TIMS-FTICR. Finally, a study in Atomic Force Microscopy will be presented and will make it possible to show real structures of molecules present in aerosols thanks to the magnification provided by this type of microscope.
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Submitted on : Monday, January 11, 2021 - 5:05:07 PM
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  • HAL Id : tel-03106310, version 1

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Julien Maillard. Composition chimique du brouillard de Titan par mobilité ionique couplée à la spectrométrie de masse haute résolution. Autre. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASV023⟩. ⟨tel-03106310⟩

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