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A flash photolysis system has been used to study the rate of reaction ( l ) , OH + CHI ---fThe temperature It is found that the Arrhenius plot of kl is strongly CHI + H20, using time-resolved resonance absorption to monitor OH. was varied between 300 and 900°K. curved and k, ( T ) can best be represented by the expression kl = 103.54 * 0.08 T3.08 exp (-1010/T) cm3/mole.sec.The apparent Arrhenius activation energy changes from 1511 kJ/mole at 300°K to 32*2 kJ/mole at 1000°K. On either side of our temperature range, both absolute rates and their temperature dependence are in good agreement with the results from most previous investigations.