A compensated microfield model for strongly coupled plasmas

摘要

Ionization equilibrium in moderate-density plasmas is described by classical Saha equations. At high plasma densities, we need to introduce a correction allowing for plasma nonideality, i.e., to take into account the interaction of plasma charged particles. This idea is realized traditionally on the basis of Debyetype models [1, 2]: the classical Debye–Hückel model, the classical Debye–Hückel model for a large canonical ensemble, models of single-component and multicomponent plasmas, the soft-slot model, etc. At low plasma densities, all the models have identical asymptotic behavior. However, they strongly diverge at high plasma densities. Attempts to compare predictions ofthese models with thermodynamic experimental data failed due to the insufficient accuracy of the corresponding experiments. Discussions that took place in the 1970s have not led to definite results. In addition, a part of these models predicted only qualitative effects like plasma phase transitions. These effects were sought by experimentalists purposefully but without any success.