Kinetics of reaction of hydrogen atoms with ethylene

Abstract

The reaction of hydrogen atoms with ethylene in excess helium at a total pressure of 8 Torr (1 Torr = 133 N m^–2) has been studied in a fast flow discharge system at five temperatures between 321 and 521 K. Mass spectrometric analysis of the reaction products has provided data, numerical analysis of which has given the temperature variation of the rate constants of the reactions H + C₂H^˙₅ [graphic omitted] 2CH^˙₃, H + CH^˙₃+ M [grephic omitted] CH₄+ M, log₁₀(k₃/dm³ mol^–1 s^–1)= 10.81 ± 0.05 –(223 ± 70)/4.5757(T/K), log₁₀(k₄/dm⁶ mol^–2 s^–1)= 13.84 ± 0.7–(0.33 ± 0.27) log₁₀(T/K), for M = He.