Kinetics of the Reaction of CH3O2 Radicals with OH Studied over the 292-526 K Temperature Range

Authors

Chao Yan, New Jersey Institute of Technology
Stefani Kocevska, New Jersey Institute of Technology
Lev N. Krasnoperov, New Jersey Institute of Technology

Document Type

Article

Publication Date

8-11-2016

Abstract

Reaction of methyl peroxy radicals with hydroxyl radicals, CH3O2 + OH → CH3O + HO2 (1a) and CH3O2 + OH → CH2OO + H2O (1b) was studied using pulsed laser photolysis coupled to transient UV-vis absorption spectroscopy over the 292-526 K temperature range and pressure 1 bar (bath gas He). Hydroxyl radicals were generated in the reaction of electronically excited oxygen atoms O(¹D), produced in the photolysis of N2O at 193.3 nm, with H2O. Methyl peroxy radicals were generated in the reaction of methyl radicals, CH3, produced in the photolysis of acetone at 193.3 nm, and subsequent reaction of CH3 with O2. Temporal profiles of OH were monitored via transient absorption of light from a DC discharge H2O/Ar low-pressure resonance lamp at ca. 308 nm. The absolute intensity of the photolysis light was determined by accurate in situ actinometry based on the ozone formation in the presence of molecular oxygen. The overall rate constant of the reaction is k1a+1b = (8.4 ± 1.7) × 10^-11(T/298 K)^{â 81} cm³ molecule^-1 s^-1 (292-526 K). The branching ratio of channel 1b at 298 K is less than 5%.

Identifier

84982174888 (Scopus)

Publication Title

Journal of Physical Chemistry A

External Full Text Location

https://doi.org/10.1021/acs.jpca.6b04213

e-ISSN

15205215

ISSN

10895639

First Page

6111

Last Page

6121

Issue

31

Volume

120

Recommended Citation

Yan, Chao; Kocevska, Stefani; and Krasnoperov, Lev N., "Kinetics of the Reaction of CH3O2 Radicals with OH Studied over the 292-526 K Temperature Range" (2016). Faculty Publications. 10329.
https://digitalcommons.njit.edu/fac_pubs/10329