147703-38-6Relevant articles and documents
Atmospheric Chemistry of HFC-143a: Spectrokinetic Investigation of the CF3CH2O2 Radical, Its Reactions with NO and NO2, and the Fate of CF3CH2O
Nielsen, Ole J.,Gamborg, Elisabeth,Sehested, Jens,Wallington, Timothy J.,Hurley, Michael D.
, p. 9518 - 9525 (1994)
The ultraviolet absorption spectrum of CF3CH2O2 rradicals, the kinetics of their self-reaction, and their reactions with NO and NO2 have been studied in the gas phase at 296 K using a pulse radiolysis technique.A long path-length Fourier transform infrared technique was used to study the fate of CF3CH2O radicals.Absorption cross sections were quantified over the wavelength range 220-300 nm.At 250 nm, ?(CF3CH2O2) = (2.73 +/- 0.31) * 10-18 molecule-1.By monitoring the rate of NO2 formation, k4 = (1.2 +/- 0.3) * 10-11 cm3 molecule-1 s-1 was found for the reaction of CF3CH2O2 radical with NO.The reaction of CF3CH2O2 radicals with NO gives CF3CH2 radicals.In the atmosphere, >99.3percent of the CF3CH2O radicals react with O2 to give CF3CHO.By monitoring the rate of NO2 decay, k5 = (5.8 +/- 1.1) * 10-12 cm3 molecule-1 s-1 was found for the reaction of CF3CH2O2 radical with NO2.The results are discussed with respect to the atmospheric chemistry of CF3CH3 (HFC-143a).As a part of the present work, relative rate techniques were used to measure the following rate constants: (2.6 +/- 0.7) * 10-12 and (2.0 +/- 0.5) * 10-12 for the reaction of F atoms with CF3CH3, (5.5 +/- 0.3) * 10-11 for the reaction of F atoms with CF3CH2OH, and (3.6 +/- 0.2) * 10-17 for the reaction with Cl atoms with CF3CH3 (units of cm3 molecule-1 s-1).
