title: Drift velocity of a Smoluchowski gas: a numerical demonstration of the fluctuation-dissipation theorem.
abstract: This Brief Report shows that the Smoluchowski thermostat, a stochastic boundary condition used to mimic a diffusive gas-wall collision, produces the correct stationary nonequilibrium states. The stationary states are generated by placing an ideal gas coupled to a Smoluchowski thermostat in a constant external field. It is shown by simple numerical simulations that the resulting drift velocity is compatible with the definition of the gas particle mobility, satisfying the well-known fluctuation-dissipation theorem. As an interesting application, it is shown that species that are chemically identical but differ in surface momentum accommodation can be separated effectively in the Knudsen regime.
authors.affiliation: Dibbitsstraat 12, 1689 EE Zwaag, The Netherlands. gustafverbeek@gmail.com
authors.forename: Martijn G
authors.initials: MG
authors.lastname: Verbeek