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 d
Fluorescence lifetime and quenching rate measurements of the ultraviolet and visible emission bands of the CF3 radical
โ Scribed by C.R. Quick Jr.; J.J. Tiee; J. Preses; R.E. Weston Jr.
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 421 KB
- Volume
- 114
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
โฆ Synopsis
Vacuum UV synchrotron radlatlon was used to produce electronically evclted CF3 radicals by photolysis of CFzCl, CF3Br, and CF31. The collrsion-free fluorescence hfetlme of both the UV and vlsrble etission bands of CFJ was measured to be 14-17 ns ask_:: a time-resolved photoncountmg detectlon system. The quenching rates of the UV and rwble band emlssmns by CF3 precursor molecules are (l-6) x 107 s-l Torr-'
๐ SIMILAR VOLUMES
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
CF 3 CF 2 CH 2 OH is a new chlorofluorocarbon (CFC) alternative. However, there are few data about its atmospheric fate. The kinetics of its atmospheric oxidation, the OH radical reaction of CF 3 CF 2 CH 2 OH, has been investigated in a 2-liter Pyrex reactor in the temperature range of 298 ฯณ 356 K u
The rate constants for the reactions of OH radicals with CH 3 OCF 2 CF 3 , CH 3 OCF 2 CF 2 CF 3 , and CH 3 OCF(CF 3 ) 2 have been measured over the temperature range 250-430 K. Kinetic measurements have been carried out using the flash photolysis, laser photolysis, and discharge flow methods combine
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
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