Kinetics of the OH-initiated oxidation of isoprene

Pedro Campuzano-Jost, Margaret B. Williams, Luca D'Ottone, Anthony J. Hynes

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Absolute rate coefficients have been determined for the reaction OH + C5H8 (1) and two of its isotopomeric variants. Reaction (1) was studied as a function of temperature and pressure in N2, N2/O2 and He buffer gases. At room temperature, a rate coefficient, k1, of (8.56±0.26)*10−11 cm3 s−1 independent of pressure and buffer gas identity was obtained. An Arrhenius fit to data over the temperature range 250 - 340 K gave a negative activation energy of -666±150 cal/mol. HO2 production was inferred from observations of radical regeneration in the presence of NO. The absence of a kinetic isotope effect, together with the specificity of radical regeneration, indicates that reaction proceeds via an addition channel with no significant abstraction component. Our rate coefficient for reaction (1) is 15% lower than the value currently recommenced for atmospheric modeling.

Original languageEnglish (US)
Pages (from-to)693-696
Number of pages4
JournalGeophysical Research Letters
Issue number5
StatePublished - Mar 1 2000

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)


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