Laser-induced fluorescence study of the Cl-atom initiated oxidation of biogenic carbonyl compounds

PHYS 628

Kenshi Takahashi, kenshi.takahashi@kupru.iae.kyoto-u.ac.jp1, Erika Iwasaki2, Tomoki Nakayama3, Yutaka Matsumi3, and Timothy Wallington4. (1) Pioneering Research Unit for Next Generation, Kyoto University, Gokasho, Uji, 611-0011, Japan, (2) Graduate School of Science, Nagoya University, Furocho, Chikusa-ku, Nagoya, 464-8601, Japan, (3) Solar-Terrestrial Environment Laboratory, Nagoya University, Furocho, Chikusa-ku, Nagoya, 464-8601, Japan, (4) Physical & Environmental Sciences Department, Ford Motor Company, Mail Drop SRL-3083, Dearborn, MI 48121
Cl-atom initiated oxidation of some biogenic carbonyl compounds has been studied by pulsed laser photolysis coupled with laser-induced fluorescence detection(PLP-LIF) system. Cl(2P3/2) atoms were produced by photolysis of Cl2 at 351 nm and monitored by LIF spectroscopy at 134.72 nm. Rate coefficients for reactions of Cl atoms with acetone, butanone, 2-pentanone, 3-pentanone, 2-hexanone, 3-hexanone, and cyclopentanone are determined. The results for acetone and butanone are consistent with previous studies. The results for 2-pentanone, 3-pentanone, 2-hexanone, and 3-hexanone are approximately a factor of 2-3 higher than those from previous absolute rate studies. Likely explanations for these discrepancies are discussed. Tropospheric lifetimes of ketones with respect to reaction with Cl atoms are estimated and discussed.
 

PHYS Poster Session - Physical Chemistry of Atmospheric Processes
7:30 PM-10:00 PM, Wednesday, April 9, 2008 Morial Convention Center -- Hall A, Poster

Sci-Mix
8:00 PM-10:00 PM, Monday, April 7, 2008 Morial Convention Center -- Hall A, Sci-Mix

Division of Physical Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008