Abstract

Simple empirical formulas that can be used to calculate the lowering of the ionization potentials of hydrogen and helium due to the quantum-mechanical repulsion of particles in a dense plasma at small separations are presented. The formula for atomic hydrogen is a good approximation to exact quantum-mechanical calculations for hydrogen plasma, as well as data from modeling of plasma phase transitions in dense hydrogen using a modified Monte-Carlo method. The formula for helium agrees well with theoretical calculations for pressure ionization of helium.

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