Light scattering in binary gas mixtures : evidence of fast and slow sound modes

Luo, Hongda (1990) Light scattering in binary gas mixtures : evidence of fast and slow sound modes. Masters thesis, Memorial University of Newfoundland.

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    Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
    (Original Version)

Abstract

In this thesis Brillouin scattering data are presented for three different binary gas mixtures composed of species with widely different masses, i.e. Ar + H₂(mAr/mH₂ ≃20), SF₆ + CH₄ (mSF₆/mCH₄ ≃ 9), and SF₆ + H₂(mSF₆/mH₂ ≃73). Under the experimental conditions predicted by the theory a fast sound mode contribution to the light scattering spectra of Ar + H₂ mixtures has been detected. Unlike the ordinary sound mode the fast sound mode propagates only in the light component with a velocity higher than that obtained using hydrodynamic theory. However, the attempts to observe the same effect in mixtures of SF₆ + CH₄ under similar conditions were unsuccessful. An analogous slow sound mode contribution to the spectra of SF₆ + H₂ mixtures has been clearly identified and it was found this mode was, in general, much easier to detect. -- A new parameter called the effective mean free path was also introduced in order to obtain a more consistent characterization of the dynamical behavior in binary mixtures with disparate masses.

Item Type: Thesis (Masters)
URI: http://research.library.mun.ca/id/eprint/5771
Item ID: 5771
Additional Information: Bibliography: leaves 72-75.
Department(s): Science, Faculty of > Physics and Physical Oceanography
Date: 1990
Date Type: Submission
Library of Congress Subject Heading: Brillouin scattering; Gases--Spectra

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