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Author: Zhijun Zhao Publisher: 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.
Author: Zhijun Zhao Publisher: 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.
Author: Venus Maria Christina Dookwah-Roberts Publisher: ISBN: Category : Atmospheric chemistry Languages : en Pages :
Book Description
A number of weakly bound adducts play important roles in atmospheric chemistry, such as DMS OH and CS2 OH. The work comprising this dissertation involves kinetic and spectroscopic studies of adducts formed between halogen atoms and the important atmospheric trace gases CS2, CH3SCH3 (DMS), CH3I, and C2H5I. The results reported in these studies are useful for developing an understanding of the reactivity of these species and for testing the ability of electronic structure theory and reaction rate theory to predict or rationalize any observed trends. Oxidative pathways of both alkyl halides and sulfur compounds, especially DMS, are of atmospheric interest based on the roles of these species in affecting the oxidizing capacity of the troposphere and in the formation of new particles which impact the Earth s radiation budget and climate variability. The experimental approach employed laser flash photolysis (LFP) coupled with time resolved UV-visible absorption spectroscopy (TRUVVAS) to investigate the spectroscopy and kinetics of the gas phase adducts: SCS Cl, CH3I Cl, C2H5I Cl, (CH3)2S Br, and (CH3)2S I.
Author: United States. Air Force. Directorate of Chemical and Atmospheric Sciences Publisher: ISBN: Category : Atmospheric chemistry Languages : en Pages : 140
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).
Author: Zhijun Zhao
Author: Zhijun Zhao
Author: Jeffrey M. Cronkhite
Author: Rafal Strekowski
Author: Patrick L. Laine
Author: Venus Maria Christina Dookwah-Roberts
Author: 
Author: 
Author: United States. Air Force. Directorate of Chemical and Atmospheric Sciences
Author: Emily L. Moore
Author: