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A simple iterative scheme which greatly facilitates the evaluation of discretized path integrals is presented. The method is applied to study the motion of a proton in a bistable potential and the resulting configurational distribution function is compared to both the path integral Monte Carlo calculation and to the ‘‘exact’’ result. As a second illustration we present calculations of the radial distribution function for an Ar2 van der Waals dimer at two temperatures.
Thirumalai et al. (Tue,) studied this question.