O2- Ion Mobility in Dense Ne Gas: the Free Volume Model

TL;DR

This paper presents experimental data and a theoretical model for O2- ion mobility in neon gas across various densities and temperatures, using the free volume model to bridge dilute and dense gas regimes.

Contribution

It introduces a successful application of the free volume model to describe ion mobility in dense neon gas, extending previous helium-based models.

Findings

The free volume model accurately describes ion mobility across different density regimes.

The model effectively connects dilute gas behavior with hydrodynamic transport at high densities.

Experimental data supports the theoretical predictions.

Abstract

We report data of the O2- 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.