Atmospheric chemistry of HFC-236fa: Spectrokinetic investigation of the CF3CHO2•CF3 radical, its reaction with NO, and the fate of the CF3CHO•CF3 radical
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Atmospheric chemistry of HFC-236fa : Spectrokinetic investigation of the CF3CHO2•CF3 radical, its reaction with NO, and the fate of the CF3CHO•CF3 radical. / Møgelberg, Trine E.; Platz, Jesper; Nielsen, Ole J.; Sehested, Jens; Wallington, Timothy J.
I: Journal of Physical Chemistry, Bind 99, Nr. 15, 01.12.1995, s. 5373-5378.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Atmospheric chemistry of HFC-236fa
T2 - Spectrokinetic investigation of the CF3CHO2•CF3 radical, its reaction with NO, and the fate of the CF3CHO•CF3 radical
AU - Møgelberg, Trine E.
AU - Platz, Jesper
AU - Nielsen, Ole J.
AU - Sehested, Jens
AU - Wallington, Timothy J.
PY - 1995/12/1
Y1 - 1995/12/1
N2 - A pulse radiolysis technique was used to investigate the UV absorption spectrum of CF3CHO2•CF3 over the wavelength range 220-290 nm. At 250 nm the absorption cross section for CF3CHO2•CF3 was σ = (186 ± 27) × 10-20 cm3 molecule-1. The rate constant for the self-reaction rate of CF3CHO2•CF3 was determined to be (5.6 ± 0.7) × 10-12 cm3 molecule-1 s-1. By following the increase in NO2 at 400 nm, the rate constant for the reaction of CF3CHO2•CF3 with NO was found to be (1.1 ± 0.3) × 10-11 cm3 molecule-1 s-1. The reaction of CF3CHO2•CF3 with NO gives CF3CHO•CF3. A Fourier transform infrared technique was used to show that in the atmosphere >99% of CF3CHO•CF3 react with O2 to give CF3COCF3. The atmospheric fate of CF3COCF3 is photolysis or incorporation into rain-cloud-sea water followed by rapid hydrolysis. As part of the present work relative rate techniques were used to measure rate constants at 295 ± 2 K for the reactions of Cl and F atoms with CF3CH2CF3 of <8 × 10-17 and (1.8 ± 0.4) × 10-13 cm3 molecule-1 s-1, respectively. In addition, the rate constant for reaction of F atoms with (CF3)2CHOH was determined to be (3.5 ± 1.1) × 10-12 cm3 molecule-1 s-1. All experiments were performed at 296 ± 2 K.
AB - A pulse radiolysis technique was used to investigate the UV absorption spectrum of CF3CHO2•CF3 over the wavelength range 220-290 nm. At 250 nm the absorption cross section for CF3CHO2•CF3 was σ = (186 ± 27) × 10-20 cm3 molecule-1. The rate constant for the self-reaction rate of CF3CHO2•CF3 was determined to be (5.6 ± 0.7) × 10-12 cm3 molecule-1 s-1. By following the increase in NO2 at 400 nm, the rate constant for the reaction of CF3CHO2•CF3 with NO was found to be (1.1 ± 0.3) × 10-11 cm3 molecule-1 s-1. The reaction of CF3CHO2•CF3 with NO gives CF3CHO•CF3. A Fourier transform infrared technique was used to show that in the atmosphere >99% of CF3CHO•CF3 react with O2 to give CF3COCF3. The atmospheric fate of CF3COCF3 is photolysis or incorporation into rain-cloud-sea water followed by rapid hydrolysis. As part of the present work relative rate techniques were used to measure rate constants at 295 ± 2 K for the reactions of Cl and F atoms with CF3CH2CF3 of <8 × 10-17 and (1.8 ± 0.4) × 10-13 cm3 molecule-1 s-1, respectively. In addition, the rate constant for reaction of F atoms with (CF3)2CHOH was determined to be (3.5 ± 1.1) × 10-12 cm3 molecule-1 s-1. All experiments were performed at 296 ± 2 K.
UR - http://www.scopus.com/inward/record.url?scp=0037511976&partnerID=8YFLogxK
M3 - Journal article
AN - SCOPUS:0037511976
VL - 99
SP - 5373
EP - 5378
JO - Journal of Physical Chemistry
JF - Journal of Physical Chemistry
SN - 0022-3654
IS - 15
ER -
ID: 228191661