Cio Radical Yields in the Reaction of O( 1D) With Cl 2, Hcl, Chloromethanes, and Chlorofluoromethanes

Authors

Karl J. Feierabend, The College of Wooster
D. K. Papanastasiou, National Oceanic and Atmospheric Administration
J. B. Burkholder, National Oceanic and Atmospheric Administration

Publication Date

2010

Document Type

Article

Issue

45

Abstract

Absolute ClO radical product yields in the gas-phase reactions of O(¹D) with Cl₂, HCl, CCl₄, CHCl₃, CH₂Cl₂, CH₃Cl, CFCl₃, CF₂Cl₂, CF₃Cl, CHFCl₂, and CHF₂Cl are reported. Product yields were measured using pulsed-laser photolysis of O₃ to produce O(¹D) in the presence of excess reactant combined with dual wavelength differential cavity ring-down spectroscopic detection of the ClO radical. ClO radical absorption cross sections for the A²Π(v = 10) ← X²Π(v = 0) transition band head near 280 nm were determined between 200 and 296 K as part of this work. The ClO product yields obtained at room temperature were Cl₂ (0.77 ± 0.10), HCl (0.20 ± 0.04), CCl₄ (0.79 ± 0.04), CHCl₃ (0.77 ± 0.04), CH₂Cl₂ (0.73 ± 0.04), CH₃Cl (0.46 ± 0.06), CFCl₃ (0.79 ± 0.04), CF₂Cl₂ (0.76 ± 0.06), CF₃Cl (0.82 ± 0.06), CHFCl₂ (0.73 ± 0.05), and CHF₂Cl (0.56 ± 0.03), where the quoted error limits are 2σ of the measurement precision. ClO product yields in the O(¹D) + Cl₂ and CFCl₃ reactions were found to be independent of temperature between 200 and 296 K, within the precision of the measurements. The absolute ClO yields obtained in this study are compared with previously reported values determined using relative and indirect methods.

Recommended Citation

Feierabend, Karl J.; Papanastasiou, D. K.; and Burkholder, J. B., "Cio Radical Yields in the Reaction of O( 1D) With Cl 2, Hcl, Chloromethanes, and Chlorofluoromethanes" (2010). The Journal of Physical Chemistry, (45), 12052-12061. 10.1021/jp107761t. Retrieved from https://openworks.wooster.edu/facpub/145