Abstract
The absolute rate constants for the gas-phase reactions of OH + C/sub 2/H/sub 2/ and OH + C/sub 2/D/sub 2/ were measured at a total pressure of 1 atm in argon buffer gas from 333 to 1273 K by using the pulse radiolysis technique. The predominant reactions were found to change from the addition reaction at lower temperatures to the H-atom abstraction reaction at higher temperatures. The kinetic isotope effect of k(H)/k(D) was /approximately/ 1 below 393 K, 1 above 1073 K. From the experimental data of this work and the previous investigations, the second-order constant for addition reaction could be expressed as 8.5 /times/ 10/sup /minus/12/e/sup (-1400/plus minus/60)/RT/ cm/sup 3/ molecule/sup /minus/1/ s/sup /minus/1/ and for H-atom abstraction reaction as 4.5 /times/ 10/sup /minus/11/e/sup (-10,500/plus minus/3100)/RT/ cm/sup 3/ molecule/sup /minus/1/ s/sup /minus/1/. The indicated error limit in the Arrhenius activation energy is 1 standard deviation of the least-squares analysis.
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