Summary. The thermal dccornposition of CH,NO, highly dilutcd in Ar has been studicd in shock waves a t 900 < T < 1500 K and 1.5. mol/cm3. Concentration profiles of CH,NO, and NO, were rccordcd. The unimolecular rcaction was found to be in its falloff range. Limiting low pressure rate constants of k, = [Ar] . 1017.1 exp( -4Z(kcal/mol)/RT) cm3/ mol sec in the range 900 < T < 1400 K and limiting high pressure rate constants of k , = 1016.25 exp ( -(.58.5 + 0.5 kcal/mol)/RTj sec-l have been dcrivcd. A rate constant o f 1.3 . lo1, cm3/mol sec was found for the first subsequent rcaction CH,+ NO, -+ CH,O + XO.

Rate constants for the spin-forbidden dissociation process SO3+Ar→SO2+O+Ar have been measured in shock waves between 1700 and 2500 K. The results are compared with data on the low temperature (200–400 K) recombination reaction. The analysis in terms of unimolecular reaction rate theory allows for a determination of the threshold energy of the reaction.

No abstract

No abstract