Diffusion of ground state (3s²¹S₀) and metastable (3s3p³P_0,1,2) magnesium atoms in He and Ne

Abstract

The momentum transfer cross sections and the diffusion coefficients of ground state and metastable magnesium atoms in He (300-3000 K) and Ne (300-2800 K) are calculated. The measured diffusion coefficient of ground state Mg in He, D=340+or-27 cm2 s-1 for 1 Torr, which is determined at 300 K in this work, as well as all other experimental results at higher temperatures agree well with the calculations.

A method for simultaneous determination of the diffusion coefficient of particles in gas media and their reflection coefficient at the wall

“…This preliminary result is similar to that of the theoretical calculations in [13]: D(320 K) = 189 cm 2 s −1 at 1 Torr Ne. As far as we know there are no experimental data either for D or for ρ at this temperature.…”