Experimental determination of the rate constant of the reaction between C2H5O2 and OH radicals

Abstract

The rate constant of the reactionC2H5O2+OH→Productshas been measured at T=296K using laser photolysis coupled to CRDS and LIF. C2H5O2 was generated from the reaction of Cl-atoms with C2H6 at 55Torr O2, whereby Cl-atoms were generated by 248nm photolysis of (COCl)2. OH radicals were generated simultaneously by photolysing H2O2. The initial Cl-concentration (and hence C2H5O2) was determined in separate experiments by replacing C2H6 by CH3OH and thus conversion of Cl-atoms to HO2. The time-resolved OH decay was detected in excess of C2H5O2. A fast rate constant of k=(1.2±0.3)×10−10cm3s−1 was determined.