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Étude des effets des collisions dans les spectres infrarouges de CH₃I, molécule d’intérêt atmosphérique

Abstract : The work presented in this manuscript is devoted to the study of the effects of collisions in the infrared spectra of CH₃I, which is an important source of iodine, which is a catalyst for ozone destruction. Good modelling of its absorption spectrum is therefore essential for atmospheric concentration measurements. In international databases, the band ν6 is not mentioned due to the lack of spectroscopic parameters. Being very intense and localized in the atmospheric window of 11 μm, the ν6 band could be used for future IR detection of CH₃I, by instruments probing in the IR, such as the IASI-NG instrument under preparation. But first, it is necessary to provide the spectroscopic parameters of CH₃I, using laboratory spectroscopy. It is in this context that our work has been carried out. The manuscript consists of five parts. The first part concerns the spectroscopic properties of the CH3I molecule. The second part is dedicated to the apparatus, with a description of the Bruker IFS125HR FTIR spectrometer. In the third part, we present the results of the line intensities and self-broadening coefficients that are extracted from the recorded spectra. The fourth part presents the results obtained on N₂, O₂ broadening and shift coefficients. The last part is devoted to the interpretation of the collisional widening measurements, previously obtained using theoretical calculations. The dependence of these parameters on the quantum numbers J and K has been studied.
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Submitted on : Thursday, May 13, 2021 - 7:46:08 AM
Last modification on : Wednesday, June 2, 2021 - 4:26:46 PM


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  • HAL Id : tel-03225781, version 1



Yosra Attafi. Étude des effets des collisions dans les spectres infrarouges de CH₃I, molécule d’intérêt atmosphérique. Physique [physics]. Université de Paris; École nationale d'ingénieurs de Tunis (Tunisie), 2020. Français. ⟨NNT : 2020UNIP7086⟩. ⟨tel-03225781⟩



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