An expansion of general validity for the diffusive parameters of a chargedparticle in a zero-point field

The following calculations provide expressions for the drift velocity and t he average diffusion coefficient, applying to diffusion in configuration sp ace of a nonrelativistic charged particle interacting with the zero-point f ield of stochastic electrodynamics. The particle is assumed to evolve accor ding to a widely popular reduced form of the Braffort-Marshall equation, wh ich is free from runaway solutions, and supposed to be found in stationary conditions, with regard to the average values of physical quantities. The r esults show an interesting similarity with the equations of quantum mechani cs. (C) 2001 American Institute of Physics.