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The recently introduced method of partial averaging is developed in a general formalism for computing simple Cartesian path integrals. Examples of its application to both harmonic and anharmonic systems are given. For harmonic systems, where analytical results can be derived, both imaginary and complex time evolution is discussed. For two representative anharmonic systems, Monte Carlo path integral simulations of the imaginary time propagator (statistical density matrix) are presented. Connections with other Cartesian path integral techniques are stressed.

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Copyright (year) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in R.D. Coalson, D.L. Freeman and J.D. Doll, “Partial Averaging Approach to Fourier Coefficient Path Integration,” J. Chem. Phys., 85, 4567-4583 (1986) and may be found at