Evidence for multiple scattering effects in the electron mobility in dense argon gas

TL;DR

This study measures electron drift mobility in dense argon gas across various conditions, confirming a model that incorporates multiple scattering effects to accurately describe mobility behavior.

Contribution

It provides experimental validation for a heuristic model that accounts for multiple scattering effects in electron mobility in dense argon gas.

Findings

Measurements confirm the validity of the multiple scattering model.

Multiple scattering effects are essential for accurate mobility predictions.

The energy dependence of the scattering cross section influences mobility behavior.

Abstract

We report measurements of the electron drift mobility in dense argon gas over an extended range of densities, temperatures, and electric fields, supplementing our earlier work. The measurements confirm the validity of the heuristic model we previously developed by introducing multiple scattering effects in the classical kinetic theory description of the electron mobility in a dilute gas. We definitively show that, in the argon gas, because of the particular energy dependence of its electron-atom momentum-transfer scattering cross section, none of the multiple scattering effects we have identified in the past can be neglected if the mobility behavior is to be accurately rationalized over the whole investigated parameter range.