Abstract
In a low-density environment, where atoms and ions are essentially free, atomic population kinetics of gases and plasmas has been very successful in many different scientific and technical disciplines. As density increases, the free atom model breaks down resulting in a perturbation of the atomic energy levels and a corresponding ionization potential depression IPD. The IPD is of great fundamental interest, for thermodynamic applications and also for the understanding of the various radiative properties (emission, absorption, scattering). Different IPD models are discussed including the finite temperature ion sphere FTIS model and the Atomic-Solid-Plasma ASP model. The ASP model accounts for the difference between real atomic ionization potentials in solids and free atoms taking into account the structure of the valence band and the Fermi energy. The FTIS model accounts for self-consistent screening effects of both bound and free electrons inside the ion sphere with effective radius depending on plasma density. Different regimes of ionization potential depression are considered as well as plasma polarization shifts of X-ray spectral lines. Finally, Fermi surface rising in much above solid density compressed matter is discussed leading to increased K-edge energies rather than decreased ones.
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Rosmej, F.B., Astapenko, V.A., Lisitsa, V.S. (2021). Ionization Potential Depression. In: Plasma Atomic Physics. Springer Series on Atomic, Optical, and Plasma Physics, vol 104. Springer, Cham. https://doi.org/10.1007/978-3-030-05968-2_8
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