Atmospheric chemistry of HFC-227ca: Spectrokinetic investigation of the CF{sub 3}CF{sub 2}CF{sub 2}O{sub 2} radical, its reactions with NO and NO{sub 2}, and the atmospheric fate of the CF{sub 3}CF{sub 2}CF{sub 2}O radical
- Riso National Lab., Roskilde (Denmark)
- Ford Motor Co., Dearborn, MI (United States)
- Ford Motor Co., Aachen (Germany)
A pulse radiolysis technique was used to study the UV absorption spectrum of CF{sub 3}CF{sub 2}CF{sub 2}O{sub 2} radicals, at 230 nm {sigma} = (3.2{+-}0.4) x 10{sup -18} cm{sup 2} molecule{sup -1}. Rate constants for reactions of CF{sub 3}CF{sub 2}CF{sub 2}O{sub 2} radicals with NO and NO{sub 2} were determined. The rate constant for reaction of F atoms with CF{sub 3}CF{sub 2}CF{sub 2}H was determined by using an absolute rate technique. The atmospheric fate of CF{sub 3}CF{sub 2}CF{sub 2}O radicals is decomposition via C-C bond scission to give CF{sub 3}CF{sub 2} radicals and CF{sub 2}O. In one bar of SF{sub 6} at 296 K, CF{sub 3}CF{sub 2}CF{sub 2}O radicals decompose with a rate > 1.5 x 10{sup 5} s{sup -1}. In their turn CF{sub 3}CF{sub 2} radicals are converted into CF{sub 3}CF{sub 2}O radicals which also decompose via C-C bond scission. The results are discussed with respect to the atmospheric chemistry of HFC-227ca. 30 refs., 12 figs., 1 tab.
- OSTI ID:
- 263156
- Journal Information:
- Journal of Physical Chemistry, Vol. 100, Issue 16; Other Information: PBD: 18 Apr 1996
- Country of Publication:
- United States
- Language:
- English
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