Premium
Measurements of the kinetics of the OH‐initiated oxidation of isoprene: Radical propagation in the OH + isoprene + O 2 + NO reaction system
Author(s) -
Stevens P.,
L'Esperance D.,
Chuong B.,
Martin G.
Publication year - 1999
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/(sici)1097-4601(1999)31:9<637::aid-kin5>3.0.co;2-o
Subject(s) - isoprene , chemistry , radical , kinetics , reaction rate constant , torr , photochemistry , reaction mechanism , organic chemistry , catalysis , thermodynamics , polymer , physics , quantum mechanics , copolymer
The mechanism of the OH‐initiated oxidation of isoprene in the presence of NO and O 2 has been investigated using a discharge‐flow system at 298 K and 2 torr total pressure. OH radical concentration profiles were measured using laser‐induced fluorescence as a function of reaction time. The rate constant for the reaction of OH + isoprene was measured to be (1.10 ± 0.05) × 10 −10 cm 3 mol −1 s −1 . In the presence of NO and O 2 , regeneration of OH radicals by the reaction of isoprene‐based peroxy radicals with NO was measured and compared to simulations of the kinetics of this system. The results of these experiments are consistent with an overall rate constant of 9 × 10 −12 cm 3 mol −1 mol −1 (with an uncertainty factor of 2) for the reaction of isoprene‐based hydroxyalkyl peroxy radicals with NO. © 1999 John Wiley & Sons, Inc. Int J Chem Kinet 31: 637–643, 1999