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We report data of the O 2 − ion mobility in neon gas over broad density and temperature ranges along with its theoretical description in terms of the thermodynamic, free volume model that has successfully been adopted for the interpretation of electron and ion mobility in superfluid and normal helium. The free volume model, which is aimed at computing the free volume accessible for the ion motion, along with the Millikan-Cunningham slip factor correction, is able to describe the ion mobility in the crossover region connecting the dilute gas regime described by the classical kinetic theory to the high density region ruled by the laws of hydrodynamic transport. [ABSTRACT FROM AUTHOR]

New Molecular Dynamics simulations have been carried out in order to get an insight on the physical mechanisms that determine the drift mobility of negative Oxygen ions in very dense Neon gas in the supercritical phase close to the critical point. Two ion-neutral interaction potentials have been used that differ by their repulsive part. We have observed that the potential with a harder repulsive part gives much better agreement with the experimental data. The differences with the softer repulsive potential previously used are discussed. We propose that the behavior of the ion mobility as a function of the gas density is related to the number of neutral atoms loosely bound in the first solvation shell around the ion. [ABSTRACT FROM AUTHOR]

Discusses the generation and dynamics of microscopic bubbles in liquid argon and nitrogen as a function of various parameters. Analysis of the influence of electric fields on thermally induced bubbles; Effect of thermally and electrically induced bubbles on the electrical breakdown characteristics of liquids; Conditions that have to be fulfilled to produce electrical discharges in vapor.