Ionization state calculation of materials in high energy density system based on an improved calculation method of individual electron accounting model

In this paper, an improved calculation method of the individual electron accounting model (IEM) is proposed, and based on it, the ionization state of materials in the high energy density system is calculated. The Newton–Raphson method is introduced to the IEM to establish a method for calculating the ionization state that can ensure high accuracy with a small number of iterations. The method for determining the Zimmerman–More parameters used in this method is established. The reliability of the proposed method is verified through comparison with the calculation results of the Thomas–Fermi model and the BADGER code.