Molecular dynamics simulation for modeling plasma spectroscopy

TL;DR

This paper presents molecular dynamics simulations to model plasma spectroscopy, specifically focusing on ion-electron interactions and dipole relaxation, aiming to improve and benchmark plasma radiative property models.

Contribution

It introduces a molecular dynamics approach with a regularized potential to accurately simulate ion-electron coupling and dipole relaxation in plasmas, providing reference data for model validation.

Findings

Simulations accurately reproduce ion-electron coupling properties.

The method offers a benchmark for plasma radiative models.

Two-component plasma simulations are validated for accuracy.

Abstract

The ion-electron coupling properties for a ion impurity in an electron gas and for a two component plasma are carried out on the basis of a regularized electron-ion potential removing the short-range Coulomb divergence. This work is largely motivated by the study of radiator dipole relaxation in plasmas which makes a real link between models and experiments. Current radiative property models for plasmas include single electron collisions neglecting charge-charge correlations within the classical quasi-particle approach commonly used in this field. The dipole relaxation simulation based on electron-ion molecular dynamics proposed here will provide means to benchmark and improve model developments. Benefiting from a detailed study of a single ion imbedded in an electron plasma, the challenging two-component ion-electron molecular dynamics simulations are proven accurate. They open new possibilities to obtain reference lineshape data.