Depolarized light-scattering spectroscopy and polymer characterization |
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Authors: | G.D. Patterson D.J. Ramsay P.J. Carroll |
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Affiliation: | Department of Chemistry, Carnegie-Mellon University, Pittsburgh, PA 15213 U.S.A.;AT and T Bell Laboratories, Murray Hill, NJ 07974 U.S.A. |
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Abstract: | Light scattering has long been established as a technique for measuring the molecular weight and radius of gyration of polymer molecules. Depolarized light scattering can be studied accurately with lassers. The theory of static and dynamic depolarized light-scattering spectroscopy is presented and illustrated with two examples of novel particles in solution. From the static intensity measured as a function of angle, the length of rod-like molecules can be evaluated. More complicated geometrical measures are obtained in the eneral case. From the dynamic light scattering, the translational self-diffusion coefficient and the rotational diffusion coefficient are obtained. These quantities can be interpreted in terms of a major semi-axis length and an axial ratio for the molecule or particle by using the Perrin equations. |
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