Atmospheric chemistry of HFC-143a: Spectrokinetic investigation of the CF3CH2O2• radical, its reactions with NO and NO2, and the fate of CF3CH2O
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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; Wellington, Timothy J.; Hurley, Michael D.
I: Journal of Physical Chemistry, Bind 98, Nr. 38, 01.12.1994, s. 9518-9525.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Atmospheric chemistry of HFC-143a
T2 - Spectrokinetic investigation of the CF3CH2O2• radical, its reactions with NO and NO2, and the fate of CF3CH2O
AU - Nielsen, Ole J.
AU - Gamborg, Elisabeth
AU - Sehested, Jens
AU - Wellington, Timothy J.
AU - Hurley, Michael D.
PY - 1994/12/1
Y1 - 1994/12/1
N2 - The ultraviolet absorption spectrum of CF3CH2O2 radicals, 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, σ(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 CF3CH2O radicals. In the atmosphere, >99.3% 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).
AB - The ultraviolet absorption spectrum of CF3CH2O2 radicals, 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, σ(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 CF3CH2O radicals. In the atmosphere, >99.3% 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).
UR - http://www.scopus.com/inward/record.url?scp=33751157784&partnerID=8YFLogxK
M3 - Journal article
AN - SCOPUS:33751157784
VL - 98
SP - 9518
EP - 9525
JO - Journal of Physical Chemistry
JF - Journal of Physical Chemistry
SN - 0022-3654
IS - 38
ER -
ID: 228192276