Kinetic Study of the OH-isoprene and O3-isoprene reaction in the atmosphere simulation chamber, SAPHIR

Kinetic studies conducted in the new atmosphere simulation chamber SAPHIR at the Research Center Julich allow a thorough investigation of oxidation of isoprene induced by O 3 and the OH radical under atmospheric conditions. Rate coefficients for the 03-isoprene and OH-isoprene reaction are determined from measured concentration-time profiles. For the reaction of O 3 with isoprene the rate coefficient is determined to be (9.6 ± 0.7) x 10 -18 cm 3 molecule -1 s -1 at 286 K. The rate coefficient for the reaction OH + isoprene is (10.0 ± 1.2) x 10 -11 cm 3 molecule -1 s -1 at 294 K. The kinetic parameters determined in SAPHIR at atmospheric concentrations agree well with recent recommendations.