corner
corner
APS » Journals » Phys. Rev. Lett. » Volume 100 » Issue 12
< Previous Article | Next Article >

Phys. Rev. Lett. 100, 124503 (2008) [4 pages]

Hugoniot Data for Helium in the Ionization Regime

Download: PDF (515 kB) Buy this article Export: BibTeX or EndNote (RIS)

J. Eggert1, S. Brygoo1,2, P. Loubeyre2, R. S. McWilliams1,3, P. M. Celliers1, D. G. Hicks1, T. R. Boehly4, R. Jeanloz3, and G. W. Collins1
1Lawrence Livermore National Laboratory, Livermore, California 94551, USA
2Departement de Physique, Théorique et Applications, CEA, Commissariat à l’Energie Atomique, 91680 Bruyères-le-Châtel, France
3University of California, Berkeley, California, USA
4Laboratory for Laser Energetics, University of Rochester, Rochester, New York, USA

Received 25 August 2007; published 28 March 2008

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 (ρ1) for each experiment was tuned to a value between ρ0L<ρ1<3.3ρ0L, where ρ0L is the zero-pressure density of the cryogenic liquid (ρ0L=0.123  g/cm3). The maximum observed shock-compression ratios range from ρ/ρ1=6 for ρ1=ρ0L to ρ/ρ1=4 for ρ1≥3ρ0L (i.e., ρ/ρ0L≥12). Data show an increase in compressibility at the onset of ionization, similar to theoretical predictions.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.124503
DOI:
10.1103/PhysRevLett.100.124503
PACS:
51.30.+i, 52.25.Kn, 62.50.−p, 64.30.−t
 
< Previous Article | Next Article >