Atmospheric fate of hydrofluoroethanes and hydrofluorochloroethanes: 1. Rate coefficients for reactions with OH

Journal Article · Wed Mar 20 04:00:00 EST 1991 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/90JD02736· OSTI ID:5458204

Gierczak, T; Talukdar, R; Lovejoy, E R; Ravishankara, A R ^[1]; Vaghjiani, G L ^[2]

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1. National Oceanic and Atmospheric Administration, Boulder, CO (USA) Univ. of Colorado, Boulder (USA)
2. Univ. of Dayton Research Inst., Edwards AFB, CA (USA)

The rate coefficients for the reactions of OH with five halocarbons (CF{sub 3}CH{sub 2} (HFC 134a), CF{sub 3}CHClF (HCFC 124), CF{sub 3}CHCl{sub 2} (HCFC 123), CH{sub 3}CHF{sub 2} (HFC 152a), and CH{sub 3}CF{sub 2}Cl (HCFC 142b)), which are proposed as alternatives to chlorofluoromethanes, have been measured. A pulsed pholtolysis system and a discharge flow apparatus were used to measure the rate coefficients between approximately 210 and 425 K. Use of the complementary techniques enabled identification of systematic errors and minimization of these errors. The obtained values are compared with values previously measured by other groups. This data base is used in the subsequent paper to calculate the atmospheric lifetimes of the five compounds.

• OSTI ID: 5458204
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 96:D3; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ALKANES
ATMOSPHERIC CHEMISTRY
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
ETHANE
FREONS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
HYDROXYL RADICALS
KINETICS
LAYERS
MATERIAL SUBSTITUTION
MEASURING INSTRUMENTS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OZONE LAYER
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
REACTION KINETICS
TEMPERATURE DEPENDENCE