Kinetics of the Gas-Phase Reactions of - and -CHCHOO Criegee Intermediate Conformers with SO as a Function of Temperature and Pressure.

Kinetics of reactions between SO and CHCHOO Criegee intermediate conformers have been measured at temperatures between 242 and 353 K and pressures between 10 and 600 Torr using laser flash photolysis of CHCHI/O/N/SO gas mixtures coupled with time-resolved broadband UV absorption spectroscopy. The kinetics of -CHCHOO + SO are pressure-dependent and exhibit a negative temperature dependence, with the observed pressure dependence reconciling apparent discrepancies between previous measurements performed at ∼298 K. Results indicate a rate coefficient of (4.

Unimolecular Kinetics of Stabilized CHCHOO Criegee Intermediates: -CHCHOO Decomposition and -CHCHOO Isomerization.

The kinetics of the unimolecular decomposition of the stabilized Criegee intermediate -CHCHOO has been investigated at temperatures between 297 and 331 K and pressures between 12 and 300 Torr using laser flash photolysis of CHCHI/O/N gas mixtures coupled with time-resolved broadband UV absorption spectroscopy. Fits to experimental results using the Master Equation Solver for Multi-Energy well Reactions (MESMER) indicate that the barrier height to decomposition is 67.2 ± 1.

Kinetics of the gas phase reaction of the Criegee intermediate CHOO with SO as a function of temperature.

The kinetics of the gas phase reaction of the Criegee intermediate CHOO with SO have been studied as a function of temperature in the range 223-344 K at 85 Torr using flash photolysis of CHI/O/SO/N mixtures at 248 nm coupled to time-resolved broadband UV absorption spectroscopy. Measurements were performed under pseudo-first-order conditions with respect to SO, revealing a negative temperature dependence. Analysis of experimental results using the Master Equation Solver for Multi-Energy well Reactions (MESMER) indicates that the observed temperature dependence, combined with the reported lack of a pressure dependence in the range 1.