Experimental studies of the electron-impact induced dissociation and dissociative excitation of simple halogen containing molecules.
Item
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Title
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Experimental studies of the electron-impact induced dissociation and dissociative excitation of simple halogen containing molecules.
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Identifier
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AAI9618104
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identifier
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9618104
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Creator
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Siegel, Ralph B.
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Contributor
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Adviser: Kurt Becker
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Date
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1996
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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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Physics, Atomic
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Abstract
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Electron-impact induced dissociative excitation of {dollar}\rm SF\sb6,\ CF\sb4,\ NF\sb3,\ CCl\sb2F\sb2,\ and\ BCl\sb3{dollar} was studied by identifying the strongest emission features following electron-impact and measuring the absolute photoemission cross sections for these emission features. Atomic fluorine (FI) resonance radiation centered at 97.5 and 95.5 nm were the most intense emission features for the fluorine containing molecules. In most cases, unique identification of the dissociation channel leading to the production of the emitting fragment was possible. Total fragmentation was dominant in {dollar}\rm SF\sb6,\ CF\sb4,\ and\ NF\sb3.{dollar} Partial fragmentation was more prominent in {dollar}\rm CCl\sb2F\sb2,\ and\ BCl\sb3.{dollar} A new "triple-beam" experiment designed to study electron-impact induced dissociation was built in which absolute electron-impact induced dissociation cross sections are measured by using laser induced fluorescence (LIF) to measure the absolute number densities of dissociation products left in the ground state. We use an effusive gas beam and a continuous electron beam in conjunction with a pulsed tunable dye laser and gated detection. The use of saturated LIF is emphasized. Preliminary data for the {dollar}\rm N\sb2 + e\sp-\to N\sbsp{lcub}2{rcub}{lcub}+{rcub}(X\sp2\Sigma\sbsp{lcub}g{rcub}{lcub}+{rcub}) + 2e\sp-{dollar} reaction was obtained. Suggestions for overcoming technical challenges and future areas of research are made.
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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.
