Experimental Studies of Ozone Depletion by Chlorofluorocarbons (CFC’s), Bromofluorocarbons (BFC’s), Hydrochlorofluorocarbons (HCFC’s), and CH<sub>3</sub>Br Using a 6-m<sup>3</sup>Photochemical Chamber
作者:Nobuaki Washida、Takashi Imamura、Hiroshi Bandow
DOI:10.1246/bcsj.69.535
日期:1996.3
BFC’s than in the CFC’s. According to a box-model simulation, in the CFCl3 system 90% of the catalytic cycle proceeds from reactions of Cl + O3 → ClO + O2 and ClO + O → Cl + O2. On the other hand, in the CF3Br system 90% of the catalytic cycle is governed by the following reactions: Br + O3 → BrO + O2 and BrO + BrO → 2Br + O2. The HCFC’s and CH3Br can destroy the ozone with sufficient potential as CFC’s
Cage Effect in the Liquid-Phase Photolysis of Fluorinated Ketones
作者:R. BOWLES、J. R. MAJER、J. C. ROBB
DOI:10.1038/187314a0
日期:1960.7
communication1, the products of photolysis of 1 : 3 dichlorotetrafluoroacetone were described, and the absence of compounds which could arise from the reactions of the chlorodifluoroacetyl radical noted. It is assumed that in this behaviour the ketone is similar to hexafluoroacetone, which has been shown to dissociate on photolysis into two trifluoromethyl radicals and a molecule of carbonmonoxide2
Kinetics of free radicals produced by infrared multiphoton-induced decomposition. 2. Formation of acetyl and dichlorofluoromethyl radicals and their reactions with nitrogen dioxide
作者:Irene R. Slagle、David Gutman
DOI:10.1021/ja00382a001
日期:1982.9
monitored in a time-resolved manner using photoionizationmassspectrometry. In this study we have produced the acetyl radial and studied its reaction with NO/sub 2/ under photoionizationmassspectrometry. In this study we have produced the acetyl radical and studied its reaction with NO/sub 2/ under pseudo-first-order conditions in order to determine not only the rate constant but also to verify the mechanism
Temperature-Dependent Electron Capture Detector Response to Common Alternative Fluorocarbons
作者:Sonia R. Sousa、Stephen E. Bialkowski
DOI:10.1021/ac9703921
日期:1997.10.1
Mechanisms for the ECD response are proposed based on thermodynamics and temperature-dependent ECD responses. CFC-12, HCFC-123, and HFC-125 apparently undergo ion-forming dissociative electroncapture. The electroncapture process for HCFC-22 and HFC-134a appear to form molecular ions. Both mechanisms appear to be operative for HCFC-124 electroncapture. Dissociative electroncapture rate constants for
Rate Measurement of the Reaction of CF<sub>2</sub>Cl Radicals with O<sub>2</sub>
作者:Jorge Codnia、María Laura Azcárate
DOI:10.1562/2006-01-04-ra-764
日期:2006.5
association reaction of the CF(2)Cl radicals with O(2) in presence of N(2). The infrared multiple photon dissociation (IRMPD) technique with a homemade TEA CO(2) laser was used for the CF(2)Cl radical generation and the vibrational chemiluminiscence technique was set up for the study of the reaction kinetics. The time-resolved IR fluorescence of the vibrationallyexcited CF(2)O photoproduct was used to