Quantum mechanics and statistical physics allow us to study the properties of the ions in detail as well as the interaction between all the charged particles (ions and electrons) in the plasma in order to know the properties of the plasma both microscopically and macroscopically.

The models we develop aim at understanding the phenomena of radiation production and, more generally, at describing the interaction of radiation with matter.

From the macroscopic point of view, our approaches allow the calculation of transport coefficients (opacity, electrical conductivity, thermal conductivity, etc.) in plasmas and, for example, the relation between pressure, density and temperature, called equation of state, in regimes not yet explored.

In addition to their fundamental character, this work has many applications, especially in astrophysics.