Kinetics and HO2 Product Yield of the Reaction C2H5O + O2 between 295 and 411 K

The kinetics of the reaction between ethoxy (C2H5O) radicals and O2 have been studied using a combined laser photolysis/LIF technique for the generation and detection of C2H5O. In the temperature range 295–411 K the rate coefficient has been found to be equation image . Product investigations using a chemical titration of HO2 by NO and subsequent quantitative detection of OH by LIF indicate the dominance of the HO2 formation channel, viz. equation image with ϕ = 0.89 (−0.12+0.22). Energy correlations show that these products are formed by a direct metathesis reaction only. It is suggested, that the low pre‐exponential factor in the Arrhenius expression may be the result of a more complex than linear configuration of the moiety in the transition state and/or of tunneling.