Chemical-Picture-Based Modeling of Thermodynamic Propertiesof Dense Multicharged-Ion Plasmas Using the Superconfigura-tion Approach

摘要

Using the chemical-picture representation of plasmas as a mixture of various ions and free electrons, a con-sistent description of thermodynamics of dense multicharged-ion plasmas is being developed that involves theeffects of Coulomb non-ideality and degeneracy of plasma electrons; contribution of the excited ion states (onthe base of the superconfiguration approach) that may exist under an appropriate truncation of ion energy spec-tra due to plasma effects; hard-sphere-model representation of the finite-volume effects of plasma ions withthe model parameters (effective ion sizes) corresponding to superconfigurations yielding the greatest contribu-tion to partition functions. We present the calculated data for average ionization, Gruneisen coefficient, andspecific heat of aluminum and iron plasmas at temperatures of 0.03-3 keV and densities 10~(-3)-10~(-5)of theirnormal material densities. Calculated thermodynamic functions and shock Hugoniots are compared with othertheoretical and experimental data.