Abstract
In the hot dense matter regime, the isothermal equation of state (EOS) of Al andAu is calculated using an average-atom (AA) model in which the broadeningof energy levels of atoms and ions are accounted for by using with a Gaussiandistribution of the density of states. The distribution of bound electrons in theenergy bands is determined by the continuum Fermi–Dirac distribution. With aself-consistent field average atoms scheme, it is shown that the energy-level broadening hasa significant effect on the isothermal equation of state (EOS) of Al and Au inthe hot dense matter regime. The jumps in the equation of state (EOS) inducedby pressure ionization of the one-electron orbital with the increase in density,which often occur in the normal average-atom model and have been avoided bygenerally introducing the pseudo-shape resonance states, disappear naturally.
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