Pressure-Dependent Kinetics of the Reaction between CH3O2 and OH: TRIOX Formation

Document Type

Article

Publication Date

10-3-2019

Abstract

Reaction of methyl peroxy radicals with hydroxyl radicals (1) was studied using pulsed laser photolysis coupled to transient UV-vis absorption spectroscopy at 296 K over the 1-100 bar pressure range (bath gas He): CH3O2 + OH → CH3O + HO2 (1a), CH3O2 + OH → CH2OO + H2O (1b), and CH3O2 + OH → CH3OOOH (TRIOX) (1d). Channel 1a is the dominant channel under ambient conditions, while the contribution of channel 1b is less than 5% at 1 bar and 296 K. Channel 1c is strongly pressure-dependent and becomes dominant at high pressures. The measured branching ratio of channel 1c is α1c = 0.87 ± 0.20 at 100 bar and 296 K. The chain termination channel 1c forming important product TRIOX is experimentally evaluated over an extended pressure range (1-100 bar) for the first time. The stabilization channel 1c might play a role at ambient pressures and low temperatures as well as high pressures at ambient and elevated temperatures.

Identifier

85072903788 (Scopus)

Publication Title

Journal of Physical Chemistry A

External Full Text Location

https://doi.org/10.1021/acs.jpca.9b03861

e-ISSN

15205215

ISSN

10895639

PubMed ID

31455078

First Page

8349

Last Page

8357

Issue

39

Volume

123

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