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Temperature dependent branching ratios of HONO_2 and HOONO from HO_x and NO_x cross reactions found using pulsed cavity-​ringdown spectroscopy

Mertens, Laura A. and Okumura, Mitchio and Sander, Stanley P. (2014) Temperature dependent branching ratios of HONO_2 and HOONO from HO_x and NO_x cross reactions found using pulsed cavity-​ringdown spectroscopy. In: 248th American Chemical Society National Meeting & Exposition, August 10-14, 2014, San Francisco, CA. http://resolver.caltech.edu/CaltechAUTHORS:20140811-131530295

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Abstract

The HO_x (HO_2 and OH) and NO_x (NO and NO_2) cycles have major roles in both ozone loss in the stratosphere and pollution from hydrocarbon oxidn. in the troposphere. Two of the central reactions in the atm. are OH + NO_2 -> HONO_2 and HO_2 + NO -> OH + NO_2.. Formation of stable compds., like HNO_3, by chain termination steps decrease radical concns. in the stratosphere and troposphere and provide sinks for both HO_x and NO_x. We employed pulsed-laser-photolysis (PLP) to generate radicals in a temp.-controlled slow flow cell and mid-IR detection of intermediates and products in real time using cavity-ringdown spectroscopy (CRDS). We have investigated the yields for HONO_2 and HOONO products, extending our previous work on the OH + NO_2 reaction at room temp. Our expts. also shed light on the branching ratio of HONO_2 from HO_2 + NO.


Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription
http://www.acs.org/content/acs/en/meetings/fall-2014.htmlOrganizationConference Website
ORCID:
AuthorORCID
Okumura, Mitchio0000-0001-6874-1137
Alternate Title:Temperature dependent branching ratios of HONO2 and HOONO from HOx and NOx cross reactions found using pulsed cavity-​ringdown spectroscopy
Additional Information:© 2014 American Chemical Society.
Record Number:CaltechAUTHORS:20140811-131530295
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140811-131530295
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48314
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Aug 2014 20:48
Last Modified:14 Sep 2015 23:32

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