Multiharmonic generation and photoemission from solid surfaces.
Item
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Title
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Multiharmonic generation and photoemission from solid surfaces.
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Identifier
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AAI9119659
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identifier
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9119659
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Creator
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Mishra, Aparajita.
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Contributor
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Adviser: Joel I. Gersten
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Date
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1991
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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, Condensed Matter | Physics, Optics | Physics, Atomic
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Abstract
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The purpose of the dissertation is to study the interaction of intense laser fields with the surfaces of metals. The goals are to elucidate the nature of the elementary processes involved, to calculate the size of various properties associated with the interactions and to determine what information concerning the surface of a metal can be obtained from such experiments. The primary attention of the dissertation is directed towards the study of the generation of optical harmonics and the electronic photoemission produced when the metal is made to interact with the strong laser field. The research involves formulating models, developing the theory for such interactions, and doing detailed calculations to determine the expected magnitudes of the effects.;The thesis begins with a study of classical collisions of electrons with the surface of a metal. The electronic excitation process in the presence of an electromagnetic wave is studied. It is found that multiple wall collisions are responsible for nonlinear effects in the classical case. Also a study is made of the classical theory for the scattering of electromagnetic radiation and the influence that multiple collisions have on the spectrum.;A perturbation theory is developed for multi-harmonic generation and multi-photon electron emission from the surface of the solid. The perturbation theory is developed for arbitrary number of photons but in the 'undressed' limit. Thus only the lowest order diagrams that contribute to a given process are included. Detailed formulas are derived and calculations performed for both a hard wall model and a finite step Sommerfeld model. Explicit formulas are obtained in the high frequency limit.;The problem of arbitrary numbers of photons and arbitrary orders are then considered in a non-perturbative theory. Thus a study is made of the interaction of electromagnetic waves with solids in a fully dressed approach. The theory is applied first to the hard wall potential, then to the finite sharp step potential and finally to the smooth step potential.
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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.
