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
Journal Article
·
· Journal of Geophysical Research; (United States)
- 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
Similar Records
Atmospheric lifetime of CHF sub 2 Br, a proposed substitute for halons
OH reaction kinetics and atmospheric lifetimes of CF[sub 3]CFHCF[sub 3] and CF[sub 3]CH[sub 2]Br
Atmospheric chemistry of HFC-143a: Spectrokinetic investigation of the CF[sub 3]CH[sub 2]O[sub 2][center dot] radical, its reactions with NO and NO[sub 2], and the fate of CF[sub 3]CH[sub 2]O
Journal Article
·
Fri May 03 00:00:00 EDT 1991
· Science (Washington, D.C.); (United States)
·
OSTI ID:6102710
OH reaction kinetics and atmospheric lifetimes of CF[sub 3]CFHCF[sub 3] and CF[sub 3]CH[sub 2]Br
Journal Article
·
Thu Feb 04 23:00:00 EST 1993
· Geophysical Research Letters (American Geophysical Union); (United States)
·
OSTI ID:6660326
Atmospheric chemistry of HFC-143a: Spectrokinetic investigation of the CF[sub 3]CH[sub 2]O[sub 2][center dot] radical, its reactions with NO and NO[sub 2], and the fate of CF[sub 3]CH[sub 2]O
Journal Article
·
Thu Sep 22 00:00:00 EDT 1994
· Journal of Physical Chemistry; (United States)
·
OSTI ID:7070982
Related Subjects
54 ENVIRONMENTAL SCIENCES
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
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