Abstract

Measurement of the diffusion loss rate of metal atoms sputtered by a pulsed gas discharge in a vessel represents a convenient method for determination of the diffusion coefficient of metal atoms in gases (J. Phys. D 30 (1997) 1878). This measurement should be combined with an appropriate diffusion model, which takes into account the experimental geometry and the interactions of the diffusing particles with the walls of the container. The effect of the latter is usually accounted for through the boundary condition used. In this work we consider a boundary condition based on a thermodynamic approach. The obtained diffusion model for cylindrical geometry is compared with experimental results for the diffusion of ground-state Mg atoms in Kr, as well as with some other model solutions.

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