Many-body interactions among helium atoms and equation of state of dense helium at high densities and temperatures

摘要

Based on ab initio self-consistent-field technique and atomic cluster method, the various many-body interactions among atoms in dense helium have been computed. By this way, the static high pressure measurements are perfectly explained. A new simple formula for calculation the total energy is proposed by directly combining the two-body potential with the atomic potential. Over a large volume and temperature range of 7.5(similar to)1.74 cm3/mol and 2000(similar to)21000K, the equation of state (EOS) of helium is given.