Mobility of O2- ions in supercritical Ar: Experiment and Molecular Dynamics Simulations
Abstract
A new analysis and new Molecular Dynamics (MD) simulations of the measurements of the mobility μi of O2- ions in dense supercritical Ar gas are reported. μi shows a marked dependence on the distance from the critical temperature Tc. A mobility defect appears as a function of the gas density and its maximum value occurs below the critical density. The locus of points of maximum mobility defect in the P-T plane appears on the extrapolation of the coexistence curve into the single-phase region. MD simulations quantitatively reproduce the mobility defect near Tc.
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