Abstract
The diffusion coefficient D of sodium in neon has been measured at 530K. In a cylindrical discharge tube filled with neon at densities N of 1023 to 1024 m-3 a strong radial sodium density gradient is induced by means of a discharge current. In the afterglow of the discharge the decay rate of the fundamental diffusion mode is measured using dye laser absorption at the sodium D1 line. The value DN=(1.43+or-0.18)*1021 m-1 s-1 is found. The diffusion coefficient is calculated for temperatures between 300 and 600K using Lennard-Jones (n-6) interaction potentials with n=12, 8 and 7, and using a Born-Mayer potential. Potential parameters are taken from the literature. Best agreement with experiment is found for the Born-Mayer potential and for the Lennard-Jones (7-6) potential.
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