Light scattering study of structure and dynamics in the liquid-glass transition.
Item
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Title
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Light scattering study of structure and dynamics in the liquid-glass transition.
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Identifier
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AAI9908362
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identifier
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9908362
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Creator
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Shen, Guoqing.
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Contributor
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Adviser: Herman Z. Cummins
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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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Physics, Molecular | Physics, Optics | Physics, Condensed Matter
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Abstract
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Polarized and depolarized Brillouin spectra of several fragile glass-forming materials were measured and analyzed by different implementations of the Mountain theory to study the dynamics of liquids near the liquid-glass transition. Isotropic spectra of those materials were also obtained, but the Mountain modes were very weak. The results indicate that the conventional subtraction approach is not valid for liquids of anisotropic molecules with coupling of transverse shear waves and orientational fluctuations. To study the transverse shear waves and orientational fluctuations, polarized and depolarized Brillouin spectra of salol were collected.;Depolarized back-scattering spectra of trimethyl-heptane were obtained in the frequency range of 0.3 GHz to 4000 GHz with a temperature range of 180 to 294K. Analysis of the corresponding susceptibility spectra revealed a reasonable agreement with the predictions of the idealized mode coupling theory.
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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.
