Kinetics and mechanisms of the reaction of O(1D)-atoms with CBrF3 and CBrF2CBrF2 in the gas phase and in solid argon matrices

H. Lorenzen-Schmidt; R. Weller; Otto Schrems; Claus J. Nielsen

doi:10.1117/12.166570

31 January 1994 Kinetics and mechanisms of the reaction of O(¹D)-atoms with CBrF₃ and CBrF₂CBrF₂ in the gas phase and in solid argon matrices

H. Lorenzen-Schmidt, R. Weller, Otto Schrems, Claus J. Nielsen

Author Affiliations +

Proceedings Volume 2089, 9th International Conference on Fourier Transform Spectroscopy; (1994) https://doi.org/10.1117/12.166570
Event: Fourier Transform Spectroscopy: Ninth International Conference, 1993, Calgary, Canada

Abstract

FTIR-spectroscopy has been applied for measurements of gas phase rate constants for the reactions of O(¹D) with halon 1301 (CBrF₃) and halon 2402 (CBrF₂CBrF₂). Singlet atomic oxygen has been produced by photolysis of ozone at 253.7 nm. Carbonyl fluoride (F₂CO) was the dominant product for both reaction systems. CO and CO₂ have also been formed. The rate constants have been determined to be 4.16 (+/- 0.39)10^-11 cm³/molec(DOT)sec and 9.15 (+/- 1.22)(DOT)10^-11 cm³/molec(DOT)sec, respectively. In order to identify possible intermediates these reaction systems have also been investigated in rare gas matrices. Mixtures of CBrF₃/¹⁶O₃/Ar and CBrF₃/¹⁸O₃/Ar were deposited at 12 K and irradiated at various wavelengths between 250 and 280 nm. The appearance of two intense bands in the infrared spectra at 1204.3 cm^-1 and 1249.2 cm^-1 (¹⁶O₃) or 1193.5 cm^-1 and 1250.1 cm^-1(¹⁸O₃) indicated the formation of CF₃OBr.

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H. Lorenzen-Schmidt, R. Weller, Otto Schrems, and Claus J. Nielsen "Kinetics and mechanisms of the reaction of O(¹D)-atoms with CBrF₃ and CBrF₂CBrF₂ in the gas phase and in solid argon matrices", Proc. SPIE 2089, 9th International Conference on Fourier Transform Spectroscopy, (31 January 1994); https://doi.org/10.1117/12.166570

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