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

被引：17
|
作者：
Ujevic, S [1 ]
Vitiello, SA [1 ]
机构：
[1] Univ Estadual Campinas, Inst Fis, BR-13083 Campinas, SP, Brazil
来源：
JOURNAL OF CHEMICAL PHYSICS | 2003年 / 119卷 / 16期
关键词：
D O I：
10.1063/1.1611872
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of three-body interatomic contributions in the equation of state of He-4 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 affect the ground-state energy, the equilibrium, melting and freezing densities. (C) 2003 American Institute of Physics.
引用
收藏
页码：8482 / 8491
页数：10
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