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Measuring Rate Constants For Reactions Of The Simplest Criegee Intermediate Ch2oo By Monitoring The Oh Radical
Liu, Yingdi
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https://hdl.handle.net/2142/51180
Description
- Title
- Measuring Rate Constants For Reactions Of The Simplest Criegee Intermediate Ch2oo By Monitoring The Oh Radical
- Author(s)
- Liu, Yingdi
- Contributor(s)
- Sander, Stanley P.
- Bayes, Kyle D.
- Issue Date
- 2014-06-18
- Keyword(s)
- Mini-symposium: Spectroscopy in Kinetics and Dynamics
- Abstract
- Criegee radicals are important atmospheric intermediates formed from ozonolysis of alkenes. It potentially contributes to the atmospheric oxidation cycle mainly by generating OH radicals through unimolecular decomposition. In this work, we focus on studying the unimolecular decomposition reaction of the smallest Criegee intermediate (CH$_{2}$OO), which was generated by reacting CH$_{2}$I with O$_{2}$. While generating the CH$_{2}$OO molecule by reacting CH$_{2}$I with O$_{2}$, significant amounts of the OH radical were observed by laser-induced fluorescence. The addition of molecules known to react with CH$_{2}$OO increased the observed decay rates of the OH signal. Using the OH signals as a proxy for the CH$_{2}$OO concentration, the rate constant for the reaction of hexafluoroacetone with CH$_{2}$OO was determined. The rate constant for the reaction of SO$_{2}$ with CH$_{2}$OO showed no pressure dependence over the range of 50 to 200 Torr. This work provides the direct experimental evidence for the unimolecular decomposition of CH$_{2}$OO, and possible mechanisms of CH$_{2}$OO have been investigated by this multidimensional study.
- Publisher
- International Symposium on Molecular Spectroscopy
- Type of Resource
- text
- Language
- English
- Permalink
- http://hdl.handle.net/2142/51180
- DOI
- https://doi.org/10.15278/isms.2014.WH08
- Copyright and License Information
- Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/
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