Download or read book American Doctoral Dissertations written by and published by . This book was released on 1988 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Calibration of a Laser Induced Fluorescence System by Raman Scattering in Hydrogen with Application to the Detection of Hydroxyl Radicals written by James B. Passmore and published by . This book was released on 1992 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Application of Laser Photolysis Coupled to Time Resolved Optical Detection Methods to Study the Kinetics and Spectroscopy of Atmospherically Relevant Species written by Pranay P. Morajkar and published by . This book was released on 2012 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: OH and HO2 radicals play a vital role in many oxidation processes in the atmosphere. Thedegradation of volatile organic compounds under tropospheric conditions is induced by reaction withhydroxyl radicals followed by the subsequent chemistry of the initial OH oxidation products with O2.This thesis deals with the kinetic study of some of these atmospherically relevant reactions to betterunderstand their oxidation mechanisms using experimental techniques such as laser photolysiscoupled to detection by Laser Induced Fluorescence (LIF, for OH), continuous wave- Cavity RingdownSpectroscopy (cw-CRDS, for HO2) and time resolved UV spectroscopy (UV, forHexamethylbenzene-OH adduct). Different chemical systems have been studied using the above techniques: 1) the reaction ofHO2 radicals with formaldehyde, 2) the 248 nm photolysis of acetaldehyde and 3) the OH initiatedoxidation of Hexamethyl benzene. In addition to this, the spectroscopic application of cw-CRDStechnique and UV spectroscopy has been used for the measurement of absorption cross section ofselected absorption lines of formaldehyde in the near infrared region and Hexamethylbenzene-OHadduct in the UV region respectively.

Download or read book Detection of Excited States by Laser Induced Fluorescence written by A. B. Wedding and published by . This book was released on 1987 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser absorption techniques have been used to measure the collisional quenching rate coefficients for a number of levels of the hydrogen state. These rate coefficients are nearly independent of rotational and vibrational quantum number, i.e., 1.7 2.0 x ten to the negative fifteen cubic meter/s. Techniques are being developed for the measurement of electron excitation coefficients for the H2 state. Results are presented from attempts to model experimental measurements of 634 nm emission produced in collisions of pairs of oxygen metastables in the afterglow of pulsed discharges in Oxygen-Argon mixtures. Keywords: Hydrogen, Oxygen, Argon, Metastables, Electrons, Radiation, Excitation coefficient, Excited states.

Download or read book Vibrationally Mediated Photodissociation of T butyl Hydroperoxide and Hydrogen Peroxide written by Michael David Likar and published by . This book was released on 1988 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Detection of Vibrationally Excited H2 V for H Production written by William K. Bischel and published by . This book was released on 1989 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research was performed to develop laser-based detection of high-lying vibrational levels of Hydrogen to aid the development of high intensity H- ion production from H2 plasmas. A new type source of vibrationally excited H2 was developed, and a 2-photon resonantly enhanced multiphoton ionization (REMPI) was developed and was successful in detecting H2(v) in levels up to v = 11. A technique was developed for measuring the tuning range and bandwidth of a tunable ArF laser used to generate vacuum-ultraviolet photons. Two-photon absorption cross sections for X yields EF excitation in H2 were calculated for a wide range of X and EF vibrational levels. Attempts to use both one- and two-photon laser-induced fluorescence to detect excited levels were unsuccessful.

Download or read book Laser Induced Fluorescence Spectroscopy of Br2 written by David Jonathan Postell and published by . This book was released on 2007 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Laser Induced Fluorescence spectrum of the B - X system of molecular bromine was recorded using a Red and Near Infrared sensitive PMT coupled to a scanning monochromator. A 543 nm HeNe laser was used to excite three resonances. Assignment of those resonances was made. A line narrowed Nd:YAG laser was used to excite eight fluorescence progressions, six from the (79,81) bromine isotopomer and one each from the (79,79) bromine and (81,81) bromine isotopomers. Analysis of the visible bands helped determine the resonances excited by the Nd:YAG laser. Fluorescence in the near infrared region, 9500 - 14000 angstroms, was recorded involving the v = 28 - 44 vibrational levels in the ground state. This data set, together with the data from previous work from Bernath and coworkers [J. Mol. Spectrosc. 200, 104-119 (2000)], was used to derive a set of Dunham coefficients to describe the ground state. In addition, an RKR curve was constructed for levels in the X state v = 0 - 44. Thus, we have extended observation to levels three quarters of the way to the dissociation limit.

Download or read book Laser induced Fluorescence and Amplified Spontaneous Emission Detection of Hydrogen Atoms in Flames written by Christopher R. Mahon and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laser Induced Fluorescence Spectroscopy of the Hydroxyl and Methoxy Radicals written by Abdullahi H. Nur and published by . This book was released on 1991 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Detection of Products of Molecular Beam Reactions by Laser induced Fluorescence written by Joel Art Silver and published by . This book was released on 1976 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laser induced Fluorescence and Infrared Chemiluminescence Studies of Hydrogen Abstraction Reactions of F Cl and O Atoms written by Bijay Shankar Agrawalla and published by . This book was released on 1984 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laser Induced Fluorescence as a Probe of Detailed Reaction Dynamics written by Edmond Joseph Murphy and published by . This book was released on 1980 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laser induced Fluorescence Spectroscopy of Rb Atoms and Hg 2 Molecules microform written by Jan Szczęsny Supronowicz and published by National Library of Canada. This book was released on 1985 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Imaging Hydrogen Flames by Two photon Laser induced Fluorescence written by R. Miles and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A laser induced fluorescence study of OH radical desorption in the H 2 O 2 reaction on Pt written by T. Wahnström and published by . This book was released on 1989 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Photodissociation and Reaction Dynamics of Vibrationally Excited Molecules written by and published by . This book was released on 1993 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have used combined vibrational overtone excitation and laser induced fluorescence detection to study dissociation dynamics of hydroxylamine (NH[sub 2]OH), have performed our first laser induced grating experiments on water, and have begun assembling a new apparatus for preparing vibrationally excited molecules with simulated Raman excitation. We study role of vibrational excitation in photodissociation dynamics by using a vibrational state preparation technique, such as vibrational overtone excitation or stimulated Raman excitation, to create molecules with particular nuclear motions and then to excite that molecule to a dissociative electronic state.

Download or read book Two Photon Absorption Laser Induced Fluorescence for Neutral Hydrogen Profile Measurements written by and published by . This book was released on 2016 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The magnitude and spatial dependence of neutral density in magnetic confinement fusion experiments is a key physical parameter, particularly in the plasma edge. Modeling codes require precise measurements of the neutral density to calculate charge-exchange power losses and drag forces on rotating plasmas. However, direct measurements of the neutral density are problematic. In this work, we proposed to construct a laser-based diagnostic capable of providing spatially resolved measurements of the neutral density in the edge of plasma in the DIII-D tokamak. The diagnostic concept is based on two-photon absorption laser induced fluorescence (TALIF). By injecting two beams of 205 nm light (co or counter propagating), ground state hydrogen (or deuterium or tritium) can be excited from the n = 1 level to the n = 3 level at the location where the two beams intersect. Individually, the beams experience no absorption and therefore have no difficulty penetrating even dense plasmas. After excitation, a fraction of the hydrogen atoms decay from the n = 3 level to the n = 2 level and emit photons at 656 nm (the H[alpha] line). Calculations based on the results of previous TALIF experiments in magnetic fusion devices indicated that a laser pulse energy of approximately 3 mJ delivered in 5 ns would provide sufficient signal-to-noise for detection of the fluorescence. In collaboration with the DIII-D engineering staff and experts in plasma edge diagnostics for DIII-D from Oak Ridge National Laboratory (ORNL), WVU researchers designed a TALIF system capable of providing spatially resolved measurements of neutral deuterium densities in the DIII-D edge plasma. The laser systems were specified, purchased, and assembled at WVU. The TALIF system was tested on a low power hydrogen discharge at WVU and the plan was to move the instrument to DIII-D for installation in collaboration with ORNL researchers. After budget cuts at DIII-D, the DIII-D facility declined to support installation on their tokamak. Instead, after a no-cost extension, the apparatus was moved to the University of Washington-Seattle and successfully tested on the HIT-SI3 spheromak experiment. As a result of this project, TALIF measurements of the absolutely calibrated neutral density hydrogen and deuterium were obtained in a helicon source and in a spheromak, designs were developed for installation of a TALIF system on a tokamak, and a new, xenon-based calibration scheme was proposed and demonstrated. The xenon-calibration scheme eliminates significant problems that were identified with the standard krypton calibration scheme.