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Rate coefficients for reactions of OH radicals with CH 3 D, CH 2 D 2 , CHD 3 , and CD 4
Author(s) -
Frederickson Louise Bøge,
Andersen Simone Thirstrup,
Nielsen Ole John
Publication year - 2019
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/kin.21262
Subject(s) - isotopologue , chemistry , radical , analytical chemistry (journal) , methane , torr , infrared , diluent , fourier transform infrared spectroscopy , reaction rate constant , chemical kinetics , kinetics , molecule , atmospheric chemistry , nuclear chemistry , thermodynamics , organic chemistry , ozone , physics , quantum mechanics , optics
Fourier transform infrared (FTIR) smog chamber techniques were used to investigate the atmospheric chemistry of the isotopologues of methane. Relative rate measurements were performed to determine the kinetics of the reaction of the isotopologues of methane with OH radicals in cm 3 molecule −1 s −1 units: k (CH 3 D + OH) = (5.19 ± 0.90) × 10 −15 , k (CH 2 D 2 + OH) = (4.11 ± 0.74) × 10 −15 , k (CHD 3 + OH) = (2.14 ± 0.43) × 10 −15 , and k (CD 4 + OH) = (1.17 ± 0.19) × 10 −15 in 700 Torr of air diluent at 296 ± 2 K. Using the determined OH rate coefficients, the atmospheric lifetimes for CH 4– x D x ( x = 1–4) were estimated to be 6.1, 7.7, 14.8, and 27.0 years, respectively. The results are discussed in relation to previous measurements of these rate coefficients.