title: A path integral influence functional for excess electron in fluids: Density-functional formulation.
abstract: In this paper, we propose a path integral influence functional from a solvent to determine a self-correlation function of a quantum particle in classical simple fluid. It is shown that the influence functional is related to a grand potential functional of the pure solvent under a three-dimensional external field arising from a classical isomorphic polymer, on which the quantum particle is mapped. The influence functional can be calculated from the self-correlation function, the solute-solvent and the solvent-solvent pair correlation function. The obtained equation of the self-correlation function is applied to an excess electron problem in fluid helium. The Fourier path-integral Monte Carlo method is employed to perform the path integral of the electron. The solute-solvent pair correlation function is estimated from a reference interaction site model integral equation. These results obtained form our proposed influence functional and from that proposed by Chandler, Singh, and Richardson are compared with those provided by a path integral Monte Carlo simulation with the explicit helium solvent.
authors.affiliation: Department of Knowledge-based Information Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi, 441-8580 Japan.
authors.forename: Tomonari
authors.initials: T
authors.lastname: Sumi
authors.forename: Hideo
authors.initials: H
authors.lastname: Sekino