氦在电离区的雨贡纽数据。

Hugoniot data for helium in the ionization regime.

作者信息

Eggert J, Brygoo S, Loubeyre P, McWilliams R S, Celliers P M, Hicks D G, Boehly T R, Jeanloz R, Collins G W

机构信息

Lawrence Livermore National Laboratory, Livermore, California 94551, USA.

出版信息

Phys Rev Lett. 2008 Mar 28;100(12):124503. doi: 10.1103/PhysRevLett.100.124503.

DOI:10.1103/PhysRevLett.100.124503

PMID:18517873

Abstract

Hugoniot data were obtained for fluid He in the 100 GPa pressure range by shock compression of samples statically precompressed in diamond-anvil cells. The initial (precompressed) He density (rho_(1)) for each experiment was tuned to a value between rho_(0L)<rho_(1)<3.3rho_(0L), where rho_(0L) is the zero-pressure density of the cryogenic liquid (rho_(0L)=0.123 g/cm(3)). The maximum observed shock-compression ratios range from rho/rho_(1)=6 for rho_(1)=rho_(0L) to rho/rho_(1)=4 for rho_(1)> or =3rho_{0L} (i.e., rho/rho_(0L)> or =12). Data show an increase in compressibility at the onset of ionization, similar to theoretical predictions.

摘要

通过对在金刚石对顶砧中静态预压缩的样品进行冲击压缩，获得了100吉帕压力范围内液态氦的雨贡纽数据。每个实验的初始（预压缩）氦密度（ρ₁）被调整到ρ₀L＜ρ₁＜3.3ρ₀L之间的值，其中ρ₀L是低温液体的零压力密度（ρ₀L = 0.123克/立方厘米）。观察到的最大冲击压缩比范围从ρ₁ = ρ₀L时的ρ/ρ₁ = 6到ρ₁≥3ρ₀L时的ρ/ρ₁ = 4（即ρ/ρ₀L≥12）。数据显示在电离开始时可压缩性增加，这与理论预测相似。