HR: 17:30h
AN: A34B-07    [Abstracts]
TI: Laboratory Measurement of the Gas-Phase Rate Constant for Formation of Nitric Acid from the Reaction of OH and NO2
AU: Mollner, A K
EM: mollner@caltech.edu
AF: Department of Chemistry, California Institure of Technology, MC 127-72, Pasadena, CA 91125, United States
AU: Feng, L
EM: lfeng@atmi.com
AF: Department of Chemistry, California Institure of Technology, MC 127-72, Pasadena, CA 91125, United States
AU: Sprague, M K
EM: matthew.sprague@gmail.com
AF: Department of Chemistry, California Institure of Technology, MC 127-72, Pasadena, CA 91125, United States
AU: * Okumura, M
EM: mo@caltech.edu
AF: Department of Chemistry, California Institure of Technology, MC 127-72, Pasadena, CA 91125, United States
AU: Vallavudasan, S
EM: siva@jpl.nasa.gov
AF: NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States
AU: Sander, S P
EM: stanley.p.sander@jpl.nasa.gov
AF: NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States
AU: Martien, P T
EM: martien@ce.berkeley.edu
AF: Department of Chemistry, California Institure of Technology, MC 127-72, Pasadena, CA 91125, United States
AU: Martien, P T
EM: martien@ce.berkeley.edu
AF: Department of Civil and Environmental Engineering. University of California, Davis Hall, Berkeley, CA 94720, United States
AU: Harley, R A
EM: harley@ce.berkeley.edu
AF: Department of Civil and Environmental Engineering. University of California, Davis Hall, Berkeley, CA 94720, United States
AU: McCoy, A B
EM: mccoy@chemistry.ohio-state.edu
AF: Department of Chemistry, The Ohio State University, 100 W 18th Ave, Columbus, OH 43210, United States
AB: The rate constant for the reaction OH + NO₂ + M → HONO₂ + M is among the most influential parameters affecting air pollution levels. There remains significant uncertainty about this rate, due to lack of laboratory data at 1 atm and to the unknown yield of a secondary channel forming peroxynitrous acid (HOONO). New experimental measurements of both the kinetics and HOONO/HONO₂ branching ratios at 760 Torr are presented. The results are compared with current recommendations; when incorporated in models, the new parameters lead to significantly higher modeled ozone levels and reduced formation of nitric acid.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0317 Chemical kinetic and photochemical properties
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting