Photodissociation spectroscopy of the niobium dimer cation.
Item
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Title
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Photodissociation spectroscopy of the niobium dimer cation.
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Identifier
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AAI9820525
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identifier
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9820525
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Creator
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Deosaran, Shelley B.
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Contributor
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Advisers: Derek Lindsay | John R. Lombardi
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Date
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1998
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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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This thesis describes research done in the field of cluster chemistry. It is virtually divided into two parts, virtual part I describes experimental studies of matrix isolated neutral metal clusters while virtual part II describes the design and construction of a versatile instrument to do research on gas phase cluster (van der Waals and transition metal) cations and anions.;Metal clusters, groups of metal atoms consisting of two to several thousand metal atoms, are likened to the fifth state of matter (gas, liquid, solid and plasma). Their properties lie between the extremes of individual atoms and the bulk metal. Basic research on these exotic species will aid in deciphering the nature of the transition from atom to bulk and in understanding the contribution of d-d bonding in transition metals.;Virtual part I involves absorption and Raman and scattering depletion spectroscopy on the neutral diatomic clusters of vanadium and niobium. These cluster ions were produced by argon ion sputtering, mass selected with a Wien filter, and then neutralized and embedded in frozen argon matrices. They are interrogated with visible and infrared radiation to yield w{dollar}\sb{lcub}\rm e{rcub}{dollar} and w{dollar}\sb{lcub}\rm e{rcub}x\sb{lcub}\rm e{rcub}.{dollar}.;Virtual part II consists of three chapters. Chapter III describes the design and construction of the instrument to perform spectroscopic studies on gas phase cluster ions. It includes the discussion of the choice of various components and design criteria. The source is a combined laser vaporization and seeded source, employing a laser to vaporize refractory and other metals and a pulsed supersonic valve to introduce the carrier gas or other seed species. Chapter IV highlights the data acquisition and control system with the use of LabVIEW 3.1.1 for Windows and the instruments calibration and testing. Chapter V discusses photodissociation spectroscopy on the niobium dimer cation, the successes and the reasons why the photofragmentation spectrum could not be definitively assigned.
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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.
