Atmospheric Cryochemistry: Oxygen Atom Reaction with Fluorocarbon Freon 11 in Matrices. FTIR Spectra of Isolated COFCl and COFCl:Cl2 Complex in Solid Argon

Article abstract of DOI:10.1021/j100199a044

Fourier transform infrared spectroscopy has been employed to investigate the reaction of CFCl3 (Freon 11) with atomic oxygen in argon and oxygen matrices at 12 K.Ozone was employed as a photolytic oxygen atom source.The results indicate that the only primary reaction product is COFCl when the oxygen atom is in an excited state.No intermediate was observed.Upon thermal annealing after photolysis, diffusion through the matrix leads to the efficient formation of COFCl:Cl2 aggregates.The spectra obtained after irradiation in various experimental series (isotopic ozone, wavelength dependence, product growth curves) are analyzed and have been interpreted from vibrational spectra of normal and isotopically substituted COFCl isolated in argon and from vibrational spectra of their molecular complexes with Cl2 embedded in argon.Fermi resonance doublets in the ν_C=O stretching region are observed mainly for the C¹⁸OFCl species and the C¹⁶OFCl...Cl2 complex