The electron drift mobility has been measured in a wide range of temperatures and densities in neon gas and saturated vapor. The "zero-Geld" density-normalized mobility poS exhibits a strong density dependence, which cannot be accounted for by the existing multiple-scattering theories. The data, however, can be well 6tted by assuming a density dependence in the e-Ne scattering cross section.
Experiments on the transmission of negative ions from liquid neon to the vapour have been performed at various temperatures and at various liquid levels. The results show that the barrier is due to the dielectric discontinuity. The smoluchowski equation gives a good description of the results, provided that for the electric field e, the values of the field el which exists at the liquid side of the interface are used.
A mechanically driven graphite fiber microbalance is used to investigate the wetting behavior of argon on graphite. We found evidence of complete wetting above the bulk triple point T3 and incomplete wetting below. Below T3 the thickness d of the saturated adsorbed film is found to obey the power law d Q (t)", with x = -1/3, in the reduced temperature range lo-' < t = (T3 -T)/T3 < lo-'. Above T3 the film thickness diverges as d Q [In (Po/P)I", with x = -113.
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