Rate Coefficient and Branching Ratio for the Formation of Criegee Intermediate S<i>yn</i>-/A<i>nti</i>-CH₃CHOO from CH₃CHI + O₂ and the Self-Reaction of S<i>yn</i>-/A<i>nti</i>-CH₃CHOO Determined with Simultaneous IR/UV Probes.

ABSTRACT: A flow reactor coupled with a light-emitting diode at 286 nm, an infrared quantum-cascade laser near 11 μm, and an ultraviolet laser at 335 nm was implemented to probe the precursor CH₃CHI₂, syn-CH₃CHOO, and anti/syn-CH₃CHOO, respectively, in the reaction of CH₃CHI + O₂. The branching between syn- and anti-CH₃CHOO was determined to be ≈80:20 from two methods. The concentration temporal profiles of anti-CH₃CHOO, derived on comparison of infrared and ultraviolet profiles, yielded the rate coefficient for the self-reaction of anti-CH₃CHOO, k_self ^anti = (6 ± 2) × 10^-10 cm³ molecule^-1 s

SUBMITTER: Kao TY 

PROVIDER: S-EPMC11533191 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature