Author: Gus HancockPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Laser Studies of Gas Phase Radical Reaction
Author: Gus HancockLaser Studies of Gas Phase Radical Reaction
Author: Gus HancockLaser Studies of Gas Phase Radical Reactions
Author: G. HancockPublisher:
ISBN:
Category : Atoms
Languages : en
Pages : 5
Book Description
(1) CF Chemistry: Radiative lifetimes of the carbon fluoride ion has been measured, with values of 26.7 and 26. Ins obtained respectively. This is the first time that such direct measurements have been reported, and the work is now being prepared for submission to Chemical Physics Letters. (2) O + CF and O + CF2 reactions: Interferograms of IR emission accompanying the O + CF2 reaction have been recorded as a function of time, and thus the complete two dimensional (time and wavelength) mapping of the products of the reaction have been emerged. Figure 1 shows a time history of the complete IR emission (all wavelengths) following the photolysis of CF2HCl (to produce CF2 radicals) in a flow of atomic oxygen.
Laser Studies of Gas Phase Radical Reactions
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 91
Book Description
A series of measurements on free radicals produced by chemical reaction and photodissociation has been made, using laser methods for formation and in some cases, detection. Highly exothermic reactions between oxygen atoms and both CF2 and CHF radicals have been studied by time resolved Fourier transform infrared emission spectroscopy, yielding information on the reaction pathway, emitting products, kinetics of formation and quenching, and the nascent vibrational distributions. Emitting species hydrogen chloride, hydrogen fluoride, carbon monoxide, and carbon dioxide have been identified in these systems. In a second study, the quantum state distributions and polarisations of OH and OD(A2sigma+) products of the two photon dissociation of H2O and D2O at 266 nm have been measured. Results show the importance of long lived trajectories in determining the photodissociation dynamics, but the unexpected observation of low fragment alignment is unable to clarify the two photon state responsible for the excitation step. A third project has concentrated on measurements of radiative lifetimes of the CF(A2 sigma +) state, with new information on the A-X spectroscopy and on the O + CF(X2II) reaction rate constant found. Finally, preliminary measurements on the nascent CO rational distribution in the O + CS reaction is reported, and some additional experiments concerning the formation of carbene radicals in liquid phase enzyme cleavage studies are described. Carbon difluoride, Water, Deuterium. (MJM).
Laser Studies of Gas Phase Radical Reaction
Author: Gus HancockPublisher:
ISBN:
Category :
Languages : en
Pages : 3
Book Description
CF has been detected using frequency doubled dye laser radiation (rather than the Raman shifted dye laser radiation reported previously). Radiative lifetime studies have not yet been completed; pulsed production methods of CF have been used to show that conditions can be found under which it will be possible to measure reaction kinetics of the CF + O bimolecular reaction. The pulsed Fourier transform infrared emission spectrometer is now complete and is undergoing tests. A dedicated fast transient digitiser is being built and the interface to a micrometer is complete: this will enable us to take time resolved interferograms of the emission and transform these to obtain time resolved spectra of the ir active components. A graduate student is working full time on this project.
Reactions of Hydroxyl Radicals with Oxygenated Hydrocarbons in the Gas Phase: A Laser Photolysis/Laser-Induced Fluorescence Study
Author: Cornelie BänschPublisher: Logos Verlag Berlin GmbH
ISBN: 3832546324
Category : Science
Languages : en
Pages : 196
Book Description
Hydroxyl radicals (OH) play a key role in ignition processes and in the atmosphere. Thus, the detailed knowledge of the kinetics of OH reactions is crucial in combustion and atmospheric research. In this work, an experimental approach for time-resolved studies of OH radical reactions at high pressures with pulsed laser photolysis/laser-induced fluorescence was revised and the reactions of dimethyl ether, diethyl ether, and dimethoxymethane with OH radicals were investigated in detail. The results reveal a deeper insight into the reaction processes of ether compounds with OH in general, contributing to a better understanding of the combustion of different biofuels and fuel additives.
Laser Flash Photolysis Studies of Some Gas Phase Reactions of Atmospheric Interest
Author: Zhijun ZhaoPublisher:
ISBN:
Category : Dynamics
Languages : en
Pages :
Book Description
Radical reactions play central roles in regulating regional air quality and global climate. Some potentially important gas phase radical reactions are being investigated in this research project, including Cl reactions with acetone, butanone, 3-pentanone, pyridine, and dimethyl selenide (DMSe), HO2 complex formation and dissociation with formic and acetic acids, and reactive and non-reactive quenching of O(1D) by the potent greenhouse gases SO2F2, NF3, and SF5CF3. The involved radicals are generated by laser flash photolysis (LFP). Temporal profiles of either the radical reactant or a product are monitored in "real time" using atomic resonance fluorescence spectroscopy (RF), time-resolved UV-visible absorption spectroscopy (TRUVVAS), or tunable diode laser absorption spectroscopy (TDLAS), allowing kinetic and mechanistic information of these reactions to be obtained. These studies provide new knowledge of the investigated radical reactions and facilitate a better understanding of their significance in atmospheric chemistry.
Laser Studies of Gas Phase Chemical Reactions
Author: Emily L. MoorePublisher:
ISBN:
Category : Laser photochemistry
Languages : en
Pages : 416
Book Description
Studies of Gas Phase Radical Reactions
Author: Roger PatrickPublisher:
ISBN:
Category : Free radical reactions
Languages : en
Pages : 412
Book Description
Reactive Intermediates in the Gas Phase
Author: D. W. SetserPublisher: Elsevier
ISBN: 1483220214
Category : Science
Languages : en
Pages : 369
Book Description
Reactive Intermediates in the Gas Phase: Generation and Monitoring covers methods for reactive intermediates in the gas phase. The book discusses the generation and measurement of atom and radical concentrations in flow systems; the high temperature flow tubes, generation and measurement of refractory species; and the electronically excited long-lived states of atoms and diatomic molecules in flow systems. The text also describes the production and detection of reactive species with lasers in static systems; the production of small positive ions in a mass spectrometer; and the discharge-excited rare gas halide lasers. Chemists, physicists, and people working in aerochem laboratories will find the book invaluable.