Hugoniot Data for Helium in the Ionization Regime

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

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Abstract / Description of output

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.
Original languageEnglish
Article number124503
Number of pages4
JournalPhysical Review Letters
Issue number12
Publication statusPublished - 28 Mar 2008


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