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Direct experimental probing and theoretical analysis of the reaction between the simplest Criegee intermediate CH 2 OO and isoprene

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/c6cp08602k· OSTI ID:1346700
Recent advances in the spectroscopy of Criegee intermediates (CI) have enabled direct kinetic studies of these highly reactive chemical species. The impact of CI chemistry is currently being incorporated into atmospheric models, including their reactions with trace organic and inorganic compounds. Isoprene, C5H8, is a doubly-unsaturated hydrocarbon that accounts for the largest share of all biogenic emissions around the globe and is also a building block of larger volatile organic compounds. We report direct measurements of the reaction of the simplest CI (CH2OO) with isoprene, using time-resolved cavity-enhanced UV absorption spectroscopy. We find the reaction to be pressure-independent between 15–100 Torr, with a rate coefficient that varies from (1.5 ± 0.1) × 10–15 cm3 molecule–1 s–1 at room temperature to (23 ± 2) × 10–15 cm3 molecule–1 s–1 at 540 K. Quantum chemical and transition-state theory calculations of 16 unique channels for CH2OO + isoprene somewhat underpredict the observed T-dependence of the total reaction rate coefficient, but are overall in good agreement with the experimental measurements. Finally, this reaction is broadly similar to those with smaller alkenes, proceeding by 1,3-dipolar cycloaddition to one of the two conjugated double bonds of isoprene.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1346700
Report Number(s):
SAND--2017-2417J; 651479
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 12 Vol. 19; ISSN 1463-9076; ISSN PPCPFQ
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Theoretical Study of the Reaction of Carbonyl Oxide with Nitrogen Dioxide: CH 2 OO + NO 2 : THEORETICAL STUDY OF THE REACTION OF CARBONYL OXIDE WITH NITROGEN DIOXIDE journal August 2017
The reaction of Criegee intermediates with acids and enols journal January 2017
Structure-dependent reactivity of Criegee intermediates studied with spectroscopic methods journal January 2017
Criegee intermediates and their impacts on the troposphere journal January 2018
How big is the substituent dependence of the solar photolysis rate of Criegee intermediates? journal January 2018
Direct kinetics study of CH 2 OO + methyl vinyl ketone and CH 2 OO + methacrolein reactions and an upper limit determination for CH 2 OO + CO reaction journal January 2018
Unimolecular decomposition kinetics of the stabilised Criegee intermediates CH 2 OO and CD 2 OO journal January 2018
Theoretical investigation on the reaction mechanism and kinetics of a Criegee intermediate with ethylene and acetylene journal January 2019
High resolution quantum cascade laser spectroscopy of the simplest Criegee intermediate, CH 2 OO, between 1273 cm −1 and 1290 cm −1 journal June 2017
The atmospheric impacts of monoterpene ozonolysis on global stabilised Criegee intermediate budgets and SO 2 oxidation: experiment, theory and modelling journal January 2018

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