KINETICS OF THE REACTION OF GROUND-STATE OXYGEN-ATOMS WITH TRICHLOROETHYLENE FROM 295 TO 1127 K - COMPARISON TO REACTIONS WITH SOME OTHER SUBSTITUTED ETHYLENES

Rate coefficient measurements for the reaction O(P-3) + trichloroethyl ene have been obtained in two types of high-temperature photochemistry (HTP) reactors. Ground state oxygen atoms were produced by either fla sh photolysis or laser photolysis of SO2 or O2, and their relative con centrations were monitored by resonance fluorescence. The data are wel l fitted by k(295-1127 K) = 1.1 x 10-(12) exp(-695 K/T) + 1.5 x 10(-9) exp(-7508 K/T) cm(3) molecule(-1) s(-1), with 2 sigma precision limit s varying from +/-3% to +/-12% and 2 sigma accuracy limits of approxim ate to+/-22%. The rate coefficients are compared to those of O atom re actions with other chloro- and alkyl-substituted ethylenes; a unified semiempirical k(T) estimation method is established for lower temperat ures and suggested for higher temperatures. The heat of formation of C 2Cl3 is discussed.