We report the results of the experiment aimed at measuring the mobility of O−2 ions in dense argon gas in the temperature range 180 K ≤ T ≤ 300 K. We show that an adequate theoretical description of the data is obtained by using the thermodynamic Free Volume (FV) model, orig- inally developed to describe the electron bubble mobility in superfluid helium and successfully exploited for describing the O−2 mobility in near critical neon gas. The model goal is to thermodynamically predict the free space available for ion motion. By implementing the FV model with the Millikan-Cunningham (MC) slip correction factor, we can de- scribe the ion mobility in the crossover region bridging the dilute gas kinetic regime to the high-density hydrodynamic regime of ion transport. These results confirm the validity of the model and the universality of some of its features.
Free Volume Model Analysis of the O- 2 Ion Mobility in Dense Ar Gas
Borghesani, Armando Francesco
;
2022
Abstract
We report the results of the experiment aimed at measuring the mobility of O−2 ions in dense argon gas in the temperature range 180 K ≤ T ≤ 300 K. We show that an adequate theoretical description of the data is obtained by using the thermodynamic Free Volume (FV) model, orig- inally developed to describe the electron bubble mobility in superfluid helium and successfully exploited for describing the O−2 mobility in near critical neon gas. The model goal is to thermodynamically predict the free space available for ion motion. By implementing the FV model with the Millikan-Cunningham (MC) slip correction factor, we can de- scribe the ion mobility in the crossover region bridging the dilute gas kinetic regime to the high-density hydrodynamic regime of ion transport. These results confirm the validity of the model and the universality of some of its features.Pubblicazioni consigliate
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