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Thèse


Application of laser photolysis coupled to time resolved optical detection methods to study the kinetics and spectroscopy of atmospherically relevant species

Soutenue
le 11-07-2012

Par
Pranay MORAJKAR

Directeur(s) de thèse
Christa Fittschen (Université de Lille 1) / Eric Villenave

Résumé
OH and HO2 radicals play a vital role in many oxidation processes in the atmosphere. The degradation of volatile organic compounds under tropospheric conditions is induced by reaction with hydroxyl radicals followed by the subsequent chemistry of the initial OH oxidation products with O2. This thesis deals with the kinetic study of some of these atmospherically relevant reactions to better understand their oxidation mechanisms using experimental techniques such as laser photolysis coupled to detection by Laser Induced Fluorescence (LIF, for OH), continuous wave- Cavity Ring- down Spectroscopy (cw-CRDS, for HO2) and time resolved UV spectroscopy (UV, for Hexamethylbenzene-OH adduct).
Different chemical systems have been studied using the above techniques: 1) the reaction of HO2 radicals with formaldehyde, 2) the 248 nm photolysis of acetaldehyde and 3) the OH initiated oxidation of Hexamethyl benzene. In addition to this, the spectroscopic application of cw-CRDS technique and UV spectroscopy has been used for the measurement of absorption cross section of selected absorption lines of formaldehyde in the near infrared region and Hexamethylbenzene-OH adduct in the UV region respectively.

Mémoire en ligne
http://www.theses.fr/2012LIL10063
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