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.
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