Analysis of the contributions of three-body potentials in the equation of state of 4He

Details Analysis of the contributions of three-body potentials in the equation of state of 4He Analysis of the contributions of three-body potentials in the equation of state of 4He

2003-04-30

arxiv.org/abs/physics/0304115v1

Physics

Chemical Physics

18 pages, 3 figures, 4 tables

Scientific paper

10.1063/1.1611872

The effect of three-body interatomic contributions in the equation of state of 4He are investigated. A recent two-body potential together with the Cohen and Murrell (Chem. Phys. Lett. 260, 371 (1996)) three-body potential are applied to describe bulk helium. The triple-dipole dispersion and exchange energies are evaluated subjected only to statistical uncertainties. An extension of the diffusion Monte Carlo method is applied in order to compute very small energies differences. The results show how the three-body contributions affects the ground-state energy, the equilibrium, melting and freezing densities.

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