Electron scattering and transport in liquid argon

TL;DR

This paper presents a comprehensive model for electron transport in liquid argon, incorporating ab initio liquid phase cross-sections and coherent scattering, accurately reproducing experimental drift velocities and energies.

Contribution

It introduces a multi-term Boltzmann equation approach with ab initio liquid phase cross-sections, considering multipole polarisabilities and non-local exchange effects, improving accuracy over local treatments.

Findings

Accurately reproduces experimental drift velocities.

Highlights the importance of non-local exchange in cross-section calculations.

Demonstrates the significance of coherent scattering and liquid phase screening effects.

Abstract

The transport of excess electrons in liquid argon driven out of equilibrium by an applied electric field is revisited using a multi-term solution of Boltzmann's equation together with ab initio liquid phase cross-sections calculated using the Dirac-Fock scattering equations. The calculation of liquid phase cross-sections extends previous treatments to consider multipole polarisabilities and a non-local treatment of exchange while the accuracy of the electron-argon potential is validated through comparison of the calculated gas phase cross-section with experiment. The results presented highlight the inadequacy of local treatments of exchange that are commonly used in liquid and cluster phase cross-section calculations. The multi-term Boltzmann equation framework accounting for coherent scattering enables the inclusion of the full anisotropy in the differential cross-section arising from the interaction and the structure factor, without an a priori assumption of quasi-isotropy in the velocity distribution function. The model, which contains no free parameters and accounts for both coherent scattering and liquid phase screening effects, was found to reproduce well the experimental drift velocities and characteristic energies.