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Equation of state and interaction potential of helium under high temperatures and high densities

Research paper by JinWen Yang, YuanHong Yan

Indexed on: 22 Jan '09Published on: 22 Jan '09Published in: Science China : Physics, Mechanics & Astronomy



Abstract

Based on the thermodynamics statistic method, the improved variational perturbation theory and the modified quantum mechanics correction model have been used to calculate the equation of state of liquid helium at pressure from 0.7 to 108 GPa. The calculation results are in good agreement with the experimental data. The EXP-6 potential (α = 13.1) can more accurately describe the interaction of helium atoms than other potentials in the scheme. Finally, a comparison is shown between our interatomic potentials and other potentials.