TY - JOUR
T1 - UV absorption spectrum of CF3CFClO2 and kinetics of the self reaction of CF3CFCl and CF3CFClO2 and the reactions of CF3CFClO2 with NO and NO2
AU - Sehested, J.
PY - 1994
Y1 - 1994
N2 - The ultraviolet absorption spectrum of CF3CFClO2 and the kinetics of the self reactions of CF3CFCl and CF3CFClO2 radicals and the reactions of CF3CFClO2 with NO and NO2 have been studied in the gas phase at 295 K by pulse radiolysis/transient UV absorption spectroscopy. The UV absorption cross section of CF3CFCl radicals was measured to be (1.78 ± 0.22) × 10−18 cm2 molecule−1 at 220 nm. The UV spectrum of CF3CFClO2 radicals was quantified from 220 nm to 290 nm. The absorption cross section at 250 nm was determined to be (1.67 ± 0.21) × 10−18 cm2 molecule−1. The rate constants for the self reactions of CF3CFCl and CF3CFClO2 radicals were (2.6 ± 0.4) × 10−12 cm3 molecule−1 s−1 and (2.6 ± 0.5) × 10−12 cm3 molecule−1 s−1, respectively. The reactivity of CF3CFClO2 radicals towards NO and NO2 was determined to (1.5 ± 0.6) × 10−11 cm3 molecule−1 s−1 and (5.9 ± 0.5) × 10−12 cm3 molecule−1 s−1, respectively. Finally, the rate constant for the reaction of F atoms with CF3CFClH was determined to (8 ± 2) × 10−13 cm3 molecule−1 s−1. Results are discussed in the context of the atmospheric chemistry of HCFC‐124, CF3CFClH.
AB - The ultraviolet absorption spectrum of CF3CFClO2 and the kinetics of the self reactions of CF3CFCl and CF3CFClO2 radicals and the reactions of CF3CFClO2 with NO and NO2 have been studied in the gas phase at 295 K by pulse radiolysis/transient UV absorption spectroscopy. The UV absorption cross section of CF3CFCl radicals was measured to be (1.78 ± 0.22) × 10−18 cm2 molecule−1 at 220 nm. The UV spectrum of CF3CFClO2 radicals was quantified from 220 nm to 290 nm. The absorption cross section at 250 nm was determined to be (1.67 ± 0.21) × 10−18 cm2 molecule−1. The rate constants for the self reactions of CF3CFCl and CF3CFClO2 radicals were (2.6 ± 0.4) × 10−12 cm3 molecule−1 s−1 and (2.6 ± 0.5) × 10−12 cm3 molecule−1 s−1, respectively. The reactivity of CF3CFClO2 radicals towards NO and NO2 was determined to (1.5 ± 0.6) × 10−11 cm3 molecule−1 s−1 and (5.9 ± 0.5) × 10−12 cm3 molecule−1 s−1, respectively. Finally, the rate constant for the reaction of F atoms with CF3CFClH was determined to (8 ± 2) × 10−13 cm3 molecule−1 s−1. Results are discussed in the context of the atmospheric chemistry of HCFC‐124, CF3CFClH.
KW - Miljøaspekter ved energi- og industriproduktion
U2 - 10.1002/kin.550261007
DO - 10.1002/kin.550261007
M3 - Journal article
SN - 0538-8066
VL - 26
SP - 1023
EP - 1039
JO - International Journal of Chemical Kinetics
JF - International Journal of Chemical Kinetics
IS - 10
ER -