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Direct detection of the nitrooxyperoxy radicals in the oxidation of VOCs by NO_3

Takematsu, K. and Eddingsaas, N. and Barklund, S. and Okumura, M. (2010) Direct detection of the nitrooxyperoxy radicals in the oxidation of VOCs by NO_3. In: International Chemical Congress of Pacific Basin Societies (Pacifichem 2010), December 15-20, 2010, Honolulu, HI.

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The photooxidn. of volatile org. compds. (VOCs) is a significant source of secondary org. aerosols (SOA) in the troposphere. The nighttime chem. leading to SOA growth however remains less characterized. The nitrate radical NO3 is one of the most important nighttime oxidants. In the presence of oxygen, the free radical addn. of NO3 to unsatd. VOCs will lead to formation of nitrooxyalkyl peroxy radicals. While various studies have measured the further product yields and SOA formation from the reaction, the peroxy intermediate has yet to be directly obsd. We use cavity ringdown spectroscopy to directly detect the nitrooxyalkyl peroxy radicals via the A-X electronic absorption. The A-X electronic transition has enough structure to distinguish between different peroxy radicals as well as different conformers of the same peroxy radical. In order to elucidate the mechanism and formation of the intermediate, we present results from the addn. of NO3 to one of the simplest unsatd. VOCs, cis and trans 2-butene.

Item Type:Conference or Workshop Item (Paper)
Okumura, M.0000-0001-6874-1137
Additional Information:© 2012 American Chemical Society.
Record Number:CaltechAUTHORS:20120816-130105433
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33268
Deposited By: Tony Diaz
Deposited On:16 Aug 2012 21:13
Last Modified:14 Sep 2015 23:51

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