On a Conjecture about Diffusion of Gaseous Ions

A previous conjecture by the author about the diffusion coefficient of gaseous ions is restated more precisely, thereby eliminating, in particular, an error of a factor of two which seemed to be contained in it in certain cases. The conjecture, which is essentially an extension of the Nernst-Einstein relation to situations not close to equilibrium, is made plausible by a Langevin-type derivation.