  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.
