Abstract
The radiative properties of an emitter surrounded by a plasma, are modified through various mechanisms. For instance the line shapes emitted by bound-bound transitions are broadened and carry useful information for plasma diagnostics. Depending on plasma conditions the electrons occupying the upper quantum levels of radiators no longer exist as they belong to the plasma free electron population. All the charges present in the radiator environment contribute to the lowering of the energy required to free an electron in the fundamental state. This mechanism is known as ionization potential depression (IPD). The knowledge of IPD is useful as it affects both the radiative properties of the various ionic states and their populations. Its evaluation deals with highly complex n-body coupled systems, involving particles with different dynamics and attractive ion-electron forces. A classical molecular dynamics (MD) code, the BinGo-TCP code, has been recently developed to simulate neutral multi-component (various charge state ions and electrons) plasma accounting for all the charge correlations. In the present work, results on IPD and other dense plasma statistical properties obtained using the BinGo-TCP code are presented. The study focuses on aluminum plasmas for different densities and several temperatures in order to explore different plasma coupling conditions.
Highlights
For various purposes, it is necessary to simulate virtual plasma composed of electrons and ions in different ionization states
If one compares the mean energies deduced from these distribution functions with the corresponding energies of the isolated ions, it is possible to infer the ionization potential depression due to the interactions with the environment
Due to the specific implementation of the ionization/recombination protocol, our classical molecular dynamics (MD) method gives access to the potential surrounding an ion accounting for the influence of the free electrons and neighboring ions
Summary
It is necessary to simulate virtual plasma composed of electrons and ions in different ionization states. We have chosen to simulate the ions and electrons as classical particles and to incorporate a minimum of quantum information through a regularized potential allowing to model collisional ionization and recombination processes. The ionization/recombination process implemented in the code has two fundamental functions It allows the evolution of the charge state population towards a stationary state depending on temperature, density and composition of the plasma and it favors the setting up of a population of electrons temporary trapped in the ion wells. With this model, one gains the ability to describe the ion-electron coupling accounting for mixtures of ions undergoing changes of their ionization stages. An illustration is given by the electronic total energy distribution functions measured in aluminum plasmas for various conditions
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