title: Quantification of OH and HO2 radicals during the low-temperature oxidation of hydrocarbons by Fluorescence Assay by Gas Expansion technique.
abstract: •OH and •HO2 radicals are known to be the key species in the development of ignition. A direct measurement of these radicals under low-temperature oxidation conditions (T = 550-1,000 K) has been achieved by coupling a technique named fluorescence assay by gas expansion, an experimental technique designed for the quantification of these radicals in the free atmosphere, to a jet-stirred reactor, an experimental device designed for the study of low-temperature combustion chemistry. Calibration allows conversion of relative fluorescence signals to absolute mole fractions. Such radical mole fraction profiles will serve as a benchmark for testing chemical models developed to improve the understanding of combustion processes.
authors.affiliation: PhysicoChimie des Processus de Combustion et de l'Atmosphère, Unité Mixte de Recherche 8522, Université Lille Nord de France, F-59650 Villeneuve d'Ascq, France.
authors.forename: Marion
authors.initials: M
authors.lastname: Blocquet
authors.forename: Coralie
authors.initials: C
authors.lastname: Schoemaecker
authors.forename: Damien
authors.initials: D
authors.lastname: Amedro
authors.forename: Olivier
authors.initials: O
authors.lastname: Herbinet
authors.forename: Frédérique
authors.initials: F
authors.lastname: Battin-Leclerc
authors.forename: Christa
authors.initials: C
authors.lastname: Fittschen
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000379:methods*; D005453:Fluorescence; D006838:Hydrocarbons / Q000737:chemistry*; D006878:Hydroxides / Q000032:analysis*; D008956:Models, Chemical; D010084:Oxidation-Reduction; D010545:Peroxides / Q000032:analysis*; D013696:Temperature
chemical_list: D006838:Hydrocarbons; D006878:Hydroxides; D010545:Peroxides
keywords: HOx radicals; autoignition