HR: 09:00h
AN: A41G-04    [Abstracts]
TI: Atmospheric Oxidation of Iodinated Hydrocarbons
AU: * Orlando, J J
EM: orlando@ucar.edu
AF: National Center for Atmospheric Research, Atmospheric Chemistry Division, 3450 Mitchell Lane, Boulder, CO 80301, United States
AU: Wine, P H
EM: paul.wine@chemistry.gatech.edu
AF: Georgia Institute of Technology, School of Chemistry and Biochemistry, Atlanta, GA 30332, United States
AU: Nicovich, J M
EM: mike.nicovich@chemistry.gatech.edu
AF: Georgia Institute of Technology, School of Chemistry and Biochemistry, Atlanta, GA 30332, United States
AU: Huskey, D T
EM: dhuskey3@mail.gatech.edu
AF: Georgia Institute of Technology, School of Chemistry and Biochemistry, Atlanta, GA 30332, United States
AU: Allen, J E
EM: gtg506x@mail.gatech.edu
AF: Georgia Institute of Technology, School of Chemistry and Biochemistry, Atlanta, GA 30332, United States
AU: Piety, C A
EM: charles@atmos.umd.edu
AF: University of Maryland, Department of Meteorology, College Park, MD 20742, United States
AU: McKee, M L
EM: mckee@chem.auburn.edu
AF: Auburn University, Dept. of Chemistry and Biochemistry, Auburn, AL 36849, United States
AU: Wallington, T J
EM: twalling@ford.com
AF: Ford Motor Company, Ford Scientific Research Laboratory, Dearborn, MI 48121-2053, United States
AU: Hurley, M D
EM: mhurley3@ford.com
AF: Ford Motor Company, Ford Scientific Research Laboratory, Dearborn, MI 48121-2053, United States
AU: Javadi, M S
EM: meshkatjavadi@hotmail.com
AF: University of Copenhagen, Dept. of Chemistry, Universitetsparken 5, Copenhagen, DK-2100, Denmark
AU: Nielsen, O J
EM: ojn@kiku.dk
AF: University of Copenhagen, Dept. of Chemistry, Universitetsparken 5, Copenhagen, DK-2100, Denmark
AB: Iodinated hydrocarbons are emitted from natural, mostly oceanic, sources. The high fluxes of these species (dominated by methyl iodide, but including larger species as well) and their short photochemical lifetime imply potentially significant impacts on the chemistry of the marine boundary layer. Recently, we have employed a variety of experimental and theoretical methods to study the oxidation of organic iodides under atmospheric conditions. Compounds studied include a model compound, CF₃CH₂I, as well as ethyl and propyl iodides. While our studies have generally involved Cl-atom initiated processes, many of the results can be generalized to OH-initiated attack. General concepts to be discussed, in the context of the atmospheric behavior of these species, include: 1) The rates of destruction of iodinated organics via reaction with Cl-atom, and a comparison with other loss processes; 2) Oxidation pathways and end-product distributions, with a focus on the formation of alkenes from decomposition of beta-iodoalkyl radicals; and the mechanism of the reaction of alpha-iodoalkyl radicals with molecular oxygen; and 3) The reversible formation of Cl / iodoalkane adducts, and the subsequent chemistry of these species.
DE: 0317 Chemical kinetic and photochemical properties
DE: 0322 Constituent sources and sinks
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting