NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
On reaction kinetics and atmospheric lifetimes of CF3CFHCF3 and CF3CH2BrThe rate constants for the reaction of the OH radical with CF3CFHCF3 and with CF3CH2Br have been measured as a function of temperature using the discharge flow technique with laser induced fluorescence detection of the OH radicals. The temperature dependent rate coefficients are well described by a simple Arrhenius expression, k(T) = A exp(E/(RT)). For the reaction of OH with CF3CFHCF3 we find A = 3.7 x 10 exp -13 cu cm/molecules/s and E/R = 1615 K; for the reaction of OH with CF3CH2Br we report A = 1.4 x 10 exp -12 cu cm/molecule/s and E/R = 1350 K. These Arrhenius parameters imply rate coefficients at 277 K of 1.09 x 10 exp -15 cu cm/molecule/s for CF3CFHCF3 and 1.06 x 10 exp -14 cu cm/molecule/s for CF3CH2Br. We find atmospheric lifetimes for CF3CFHCH3 and CF3CH2Br of 42 years and 4.1 years, respectively. We also estimate the steady state ozone depletion potential (ODP) of the brominated species relative to CFCl3 as about 0.84 using a semiempirical model.
Document ID
19930042311
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Nelson, D. D., Jr.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Zahniser, M. S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kolb, C. E.
(Aerodyne Research, Inc. Billerica, MA, United States)
Date Acquired
August 16, 2013
Publication Date
February 5, 1993
Publication Information
Publication: Geophysical Research Letters
Volume: 20
Issue: 3
ISSN: 0094-8276
Subject Category
Environment Pollution
Accession Number
93A26308
Funding Number(s)
CONTRACT_GRANT: N00014-92-C-2004
CONTRACT_GRANT: NAS5-31847
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available