Conductivity of a Weakly Ionized Plasma as Related to Particle Diffusion in μ Space

A method is developed whereby the conductivity tensor of a collision dominated plasma is expressed in terms of the correlation function for microcurrents as in the case of a collisionless plasma. When collisions are important, the motion of particles through phase space must be considered as a stochastic, diffusionlike process rather than as a dynamical one as in the collisionless plasma. Some examples of the diffusion process are considered and the resulting conductivity is related to previous work.