CARBON DIOXIDE LASER CHEMISTRY OF CARBONYL SULFIDE & SELECTED HYDROCARBONS.
Item
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Title
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CARBON DIOXIDE LASER CHEMISTRY OF CARBONYL SULFIDE & SELECTED HYDROCARBONS.
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Identifier
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AAI8222979
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identifier
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8222979
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Creator
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SCHWEBEL, ALAN H.
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Contributor
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A. M. Ronn
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Date
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1982
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Language
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English
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Publisher
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City University of New York.
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Subject
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Chemistry, Physical
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Abstract
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CO(,2) laser excitation of carbonyl sulfide (OCS), both on and off resonance was studied. Fluorescence risetimes and falltimes of the (nu)(,3) mode was monitored after the 2(nu)(,2) mode is excited with both an unfocused and focused TEA laser. Activation of this mode is found to be 53 msec('-1)torr('-1) under unfocused condition and 23.4 msec('-1)torr('-1) under focused excitation. The decay rate constant is approximately 8 msec('-1)torr('-1) in both cases. Mechanisms and comparison to results obtained by other methods are discussed in terms of energy gaps and breathing sphere parameters for the processes involved. Under high level excitation (intensity > 10('9) W/cm('2)), no dissociation of OCS was detected under collisionless conditions. These results will be discussed in terms of the existing theoretical model of multiple photon dissociation. Laser Induced Dielectric Breakdown of carbonyl sulfide was also studied along with the plasma emission accompanying this process. The spectrum identified the species CO, C(,2), and S as the major emitters.;The Laser Induced Dielectric Breakdown Spectrum (LIDBS) of a series of hydrocarbons, fluoromethanes, and chloromethanes was studied using an Optical Multichannel Analyzer (OMA). These spectra were rich in atomic, ionic, and molecular fragments. Each of the spectra were completely identified by matching the emitting line to the literature value of that species. This technique was also used to identify impurities in a mixture of gases.;The CO(,2) laser ignition of combustible hydrocarbon mixtures with air or oxygen was studied. The results indicate that laser ignition is successful over a wide range of hydrocarbon percent, and yields less pollutant products as compared to spark ignition. The spectroscopic identification of the visible and near-infrared emission of the flames was also studied. The results are consistent with an electron-type mechanism as the initiator of combustion process.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Chemistry
