C(2)D(5)I Dissociation and D + CH(3) - - > CH(2)D + H at High Temperature: Implications to the High Pressure Rate Constant for CH(4) Dissociation

摘要

The shock tube technique with H- and D-atom atomic resonance absorption spectrometry (ARAS) detection has been used to study the the CH3 + D CH2D + H, over the temperature ranges, 924-1370 K and 1294-1753 K, respectively. First-order rate constants for the thermal decomposition of C2D5I can be expressed by the Arrhenius equation, logkC2D5I = (10.397 + or = 0.297) (7700 + or = 334 K)/T, giving kC2D5I = 2.49 x 1010 exp(-17729 K/T) s-1. The branching ratio between product channels, C2D5 + I and C2D4 + DI, was also determined. These results coupled with fast decomposition of C2D5 radicals were then used to specify (D)t in subsequent kinetics experiments with CH3 where (CH3)0 was prepared from the concurrent thermal decomposition of CH3I.