An expression for the intensity of light scattered by an isolated linear polymer chain with excluded volume has been evaluated for conditions corresponding to those met in experiment. The expression proves to be an excellent approximation to light scattering results for a very high molecular weight polystyrene fraction, thus providing an explanation for what appeared to be an anomalously large polydispersity when the data were treated according to the usual random flight model. Coil sizes were calculated and compared with the values obtained from the data by other methods.
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