Experimental Investigation of the Reactivity of RO2 Radicals: Determination of Absorption Cross Section of CH3O2 in near IR region and the Rate Constant between OH and CH3O2 Radicals

ESZTER P. FARAGÓA; ADRIANA G. BOSSOLASCO; B. VISKOLCZ; CORALIE SCHOEMAECKER; CHRISTA FITTSCHEN

Lille

Workshop; 1ère Journée Scientifique CaPPA (Chemical and Physical Properties of the Atmosphere); 2014

Peroxy radicals (RO2) are key reaction intermediates in the atmosphere, thus control the removal of primary pollutants such as NOx and Volatile Organics Compounds (VOCs. Forming of RO2 in the atmosphere: RH + OH-- R + H2O R + O2 -- RO2 In polluted (NOx-rich) environments their dominant reaction, RO2 + NO, leads to O3 formation, whereas in NOx-poor environments (f.e. in marine boundary layer (MBL)) the significant reactions are the following: Self- and cross reactions, reaction with HO2 Reaction with OH We started the experiments with the most simple and most abundant alkyl-peroxy radical, CH3O2. There was a given uncertainty in the literature3,4 on the near-IR absorption spectrum and the absorption cross section of CH3O2 radicals so the remeasuring of them was required.5 Furthermore, taking into account the total lack of any experimental or theoretical study of alkyl-peroxy radicals with OH radicals and their potential impact in low NOx environments, we have investigated the reaction of the most simple alkyl-peroxy radical, CH3O2 and OH.