ION-ION POTENTIAL OF INTERACTION WITH ACCOUNT OF IONIC CORE

Warm dense matter is characterized by strongly bound ions and is a strongly bound quantum system. Strongly bound plasma is the subject of active theoretical and experimental studies, such as the study of astrophysical objects and plasma in inertial fusion plants at present. In such a strongly coupled plasma, collective effects (screening effects) occupy an important place. The effective interaction potentials of charged particles are used to take into account screening effects, i.e. take into account the effect of surrounding particles on interparticle scattering in the system. The effect of electron nuclei can be described by the effective electron-ion potential, strongly modified near the nucleus when approaching the Coulomb potential at large distances. In a partially ionized plasma, the interaction between free electrons and ions also depends on occupied bound states. In this regard, in this article, the screened potential of the interaction of ions is considered taking into account the influence of occupied ground states on the interaction of free electrons with ions in a partially ionized plasma. The simplest form for such a pseudopotential is the empty core potential. In this article, to eliminate the influence of strong oscillations in the Fourier space, we used the potential with a soft empty core. Graphs of this potential of ion-ion interaction at various plasma parameters are presented. The considered interaction potential of ions at large distances is shielded weaker than in the case of Yukawa shielding. With an increase in the coupling parameter over long distances, the screening becomes weaker due to an increase in the ion thermal wavelength.

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