Kinetic Studies of Isoprene Reactions Initiated by Chlorine Atom
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The degradation reactions of isoprene initiated by chlorine atom were investigated using a fast-flow reactor coupled to chemical ionization mass spectrometry (CIMS) detection. The kinetic studies were performed in the pressure range of 5 to 10 Torr and at 298±2 K. The rate constant for the reaction between Cl and isoprene was measured to be (4.0±0.3)×10-10 cm3 molecule-1 s-1. Using the CIMS method, we were able to directly detect the products of the Cl-isoprene reaction, HCl and Cl-isoprene adduct. A branching ratio of (17.4±4.0)% was determined for the HCl formation. We have also measured the rate constant for the reaction of the Cl-isoprene adduct with molecular oxygen to form the β-chloroalkenylperoxy radicals, with a value of (1.0±0.3)×10-14 cm3 molecule-1 s-1. Atmospheric implications of the present experimental results are discussed.
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