Rate coefficients for reactions of OH radicals with CH 3 D, CH 2 D 2 , CHD 3 , and CD 4

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Louise Bøge Frederickson, Simone Thirstrup Andersen, Ole John Nielsen

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.

Original languageEnglish
JournalInternational Journal of Chemical Kinetics
Volume51
Issue number6
Pages (from-to)390-394
Number of pages5
ISSN0538-8066
DOIs
Publication statusPublished - 2019

    Research areas

  • deuterated methanes, isotope effects, isotopologues, OH kinetics

ID: 216915202