Atmospheric fate of CF sub 3 Br, CF sub 2 Br sub 2 , CF sub 2 ClBr, and CF sub 2 BrCF sub 2 Br
- National Oceanic and Atmospheric Administration, Boulder, CO (USA) Univ. of Colorado, Boulder (USA)
The temperature dependent UV absorption cross sections of the haloalkanes CF{sub 3}Br, CF{sub 2}ClBr, CF{sub 2}Br{sub 2}, and CF{sub 2}BrCF{sub 2} are reported. The UV absorption cross sections were measured over the temperature range 210 to 296 K and the wavelength range 190 to 320 nm. Upper limits of the rate coefficients for the reactions of OH with CF{sub 3}Br, CF{sub 2}Br{sub 2}, CF{sub 2}ClBr, and CF{sub 2}BrCF{sub 2}Br were also determined using both pulsed photolysis and flow tube techniques. The rate coefficients at 296 K were found to be <1.2 {times} 10{sup {minus}16}, <1.5 {times} 10{sup {minus}16}, <5.0 {times} 10{sup {minus}16}, and <1.5 {times} 10{sup {minus}16} cm{sup 3} molec{sup {minus}1} s{sup {minus}1} for CF{sub 3}Br, CF{sub 2}ClBr, CF{sub 2}BrCF{sub 2}Br, respectively. The UV absorption cross-section data and OH reaction rate coefficients of these species were combined with a one-dimensional model to yield atmospheric lifetimes of 65, 16, 3.2, and <20 years for CF{sub 3}Br, CF{sub 2}ClBr, CF{sub 2}Br{sub 2}, and CF{sub 2}BrCF{sub 2}Br, respectively.
- OSTI ID:
- 5331291
- Journal Information:
- Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 96:D3; ISSN JGREA; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ABSORPTION SPECTRA
ATMOSPHERIC CHEMISTRY
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
ELECTROMAGNETIC RADIATION
FREONS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROXYL RADICALS
LAYERS
LIFETIME
LOW TEMPERATURE
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MEDIUM TEMPERATURE
ONE-DIMENSIONAL CALCULATIONS
ORGANIC BROMINE COMPOUNDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OZONE LAYER
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATIONS
RADICALS
SPECTRA
TEMPERATURE DEPENDENCE
ULTRAVIOLET RADIATION