Interpretation of quasi-elastic light scattering data for flexible chains: model dependence |
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Authors: | David E Kranbuehl Peter H Verdier |
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Affiliation: | 1. Department of Chemistry, College of William and Mary, Williamsburg, Virginia 23185, USA |
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Abstract: | The autocorrelation functions and corresponding relaxation times obtained from the forward depolarized quasi-elastic light scattering experiment are exhibited for two quite similar models of flexible polymer chains in solution. A very small change in the chain dynamics is found to be sufficient to change the relaxation time from a relatively short time independent of chain length, with an autocorrelation function suggestive of an unweighted sum of contributions from all the relaxation times in the spectrum of chain motion, to a long time with an autocorrelation function identical with that for the end-to-end vector, strongly dependent upon chain length and dominated by the longest relaxation time in the spectrum. These results raise the question whether widely-used models in which information about short-range chain structure and motion is deliberately omitted can be expected to be appropriate for the interpretation of depolarized scattering experiments. |
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Keywords: | End-to-end length light scattering polarizability polymer chain dynamics quasi-elastic light scattering relaxation times |
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