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Article Abstract
Fourier transform infrared smog chamber techniques were used to study the kinetics and mechanisms of the reactions of Cl atoms and OH radicals with pentafluorophenol (CFOH) in 700 Torr total pressure of air or N diluent at 296 ± 2 K. Rate constants (OH + CFOH) = (6.88 ± 1.37) × 10 cm molecule s and (Cl + CFOH) = (2.52 ± 0.31) × 10 cm s molecule in 700 Torr air diluent were determined. In 700 Torr N, the rate constant for the reaction of CFOH with Cl atoms is linearly dependent on the Cl atom concentration. Product studies on this reaction in both 700 Torr air and 700 Torr N diluent show the formation of nonconjugated products. The photolysis constant of CFOH was determined by 254 nm UV irradiation of a CFOH and CHCHO mixture in 700 Torr air or N at 296 ± 2 K and yielded a photolysis rate constant of (CFOH) = (2.83 ± 0.25) × 10 s. Results are discussed with respect to the atmospheric chemistry of other halogenated aromatic species.
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