液氦的冲击压缩理论计算及其等效两体作用势的考察

Theoretical Calculation for the Hugoniot Curves and Studies on the Effective Two-Body Potential of Helium

1.
Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, CAEP, Chengdu 610003, China;
2.
Institute of Atomic and Molecular Science under High Temperature and High Pressure, Sichuan Union University, Chengdu 610065, China

摘要: 选择exp-6势为参考势，运用变分液体微扰理论计算了液氦体系的一次冲击和二次冲击Hugoniot曲线，并与Nellis等的冲击压缩实验数据比较，给出了与Nellis等的实验结果较符合的等效两体相互作用势的参数。研究表明，在计算高温高密度条件下液体的冲击压缩特性时，原子间的多体相互作用十分重要，多体作用的结果是软化了两体相互作用势。
- 冲击压缩 /
- 液氦 /
- 两体势
Abstract: The variational fluid perturbation theory is used to calculate the Hugoniot curves of liquid helium using the exponential-six reference potential. An effective potential which incorporates many-body effects is given by means of comparison of the theoretical and experimental data. This potential is fairly close to the optimum potential given by Nellis et al. Our study shows that when the shock-compression properties for high-temperature and high-density fluid are calculated, interatomic many-body effects are much more important and have the effect of softening the two-body potential.
- shock compression /
- liquid helium /
- two-body potential