Many—Body Contributions to Cohesive Energy of Highly Compressed Solid ^4He^＊

作     者：TIANChun-Ling LIUFu-Sheng CAILing-Cang JINGFu-Qian 

作者机构：InstituteofPhysicsSouthwestJiaotongUniversityChengdu610031 LaboratoryofShockWaveandDetonationPhysicsResearchChineseAcademyofEngineeringPhysicsMianyang621900 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2003年第20卷第5期

页      面：706-708页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 

基　　金：冲击波物理与爆轰物理国防科技重点实验室基金 西南交通大学科技发展基金 中国工程物理研究院项目 

主　　题：~4He 氦离子 粘着能量 高压缩固体 相互作用 数值计算 

摘      要：A many-body expansion of cohesive energy of solid 4He is made up to five-body term, and short-range two-, three-, four- and five-body contributions have been computed by using the Hartree-Fock self-consistent-field technique and the same atomic basis set (6311G). At high densities the Hartree-Fock part of two- and four-body contributions are repulsive, whereas the three- and five-body ones are attractive. The four-body term increases as much as 15% repulsion of two-body term, and at the same time the five-body term reduces 4% of two-body repulsion at 2.5 cm3/mol. The four- and five-body terms are found to be important to describe short-range inter-atomic interaction correctly and to compute the cohesive energy accurately in a wide compression range from 2.5 to 7.5 cm3/mol.