Using a pulse radiolysis UV absorption technique and subsequent simulations of experimental NO1 and FNO absorption transients, rate constants for reaction between CF90 and CFsO2 radicals with NO were determined, CFp02+NO+CF,O+N02 (3 ), CF,OtNO~CF,OtFNO(5).k~wasderivedtobe(1.68~0.26)X10~~'cm3molecuIe
Flow tube/LIF measurements of the rate constants for the reactions with NO of CF3O and CF3O2 radicals
β Scribed by C. Bourbon; M. Brioukov; B. Hanoune; J.P. Sawerysyn; P. Devolder
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 598 KB
- Volume
- 254
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The rate constants for the reactions CF302 + NO ~ CF30+NO 2 (1) and CF30+NO~ products (2) have been measured at room temperature using a fast flow reactor associated with a monitoring of CF30 radicals by laser induced fluorescence (LIF); for the measurement of k~, CF30 radicals are prepared by the discharge flow technique in the reactive system F/CF3H/OjNO; the average value is k t = (1.76 + 0.35)Γ 10-II cm 3 molecule-~ s-1. For reaction (2), CF30 radicals are prepared by another source: the thermolysis of the dimer CF3OOCF 3 and the derived rate constant is k 2 ~ (4.7 + 0.9)Γ 10 ~ cm 3 molecule-t s-~. Our results are in reasonable agreement with recent measurements using different techniques.
π SIMILAR VOLUMES
Flash photolysis/time-resolved UV absorption measurements of the rate constants for the title reactions are reported over the temperature range 2 lo-253 K. The photolysis of F2/CF,H/03/02/N, gas mixtures reveals that the formation of CF302 and CF,O radicals has no measurable effect on the ozone conc
Using the pulse radiolysis WV absorption technique and subsequent simulations of experimental absorption transients at and 276 nm, upper limits of the rate constants for the reactions of CF302 and CF,O radicals with ozone were determined at K, CF302 t OI-+CF,Ot 202 (4), CF,O t 03+CF302+02 (5). The u
Rate constants have been measured over the temperature range 245-419 K for the gas-phase reactions of the hydmxyl radical with the hydrofluorocarbons CHF,CF,CF,CHF, and CF&HFCHFCF2CF,. The Arrhenius expressions k (CHF,CF,CFzCHF,) =(7.80i3.40)X10-'3exp[-(1.51~0.26)~103/T] and k(CF,CHFCHFCF~CF,)=(4.21
The linear absorption cross-sections and photodissociation quantum yields for C F 3 N 0 have been measured at the wavelengths 694 3 and 632 8 nm (ruby and He-Ne lasers respectively) in a wide range of total pressure at T = 296 K The secondary reactions following the photolysis of C F 3 N 0 have been