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The ``random flight'' distribution function for the relative positions of two segments of a linear polymer chain is based on the assumption that the space occupied by a single polymer segment is relatively small and may be neglected. In this paper, the space requirements of a real polymer chain are taken into account. A generalized Fokker-Planck equation is formulated, and the distribution function, the average square distance, and the average inverse distance between two chain segments are calculated.
Hérmans et al. (Mon,) studied this question.