Measuring Rate Constants For Reactions Of The Simplest Criegee Intermediate Ch2oo By Monitoring The Oh Radical

Liu, Yingdi

Permalink

https://hdl.handle.net/2142/51180 Copy

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/

Owning Collections