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    Phys Rev Lett. 2008 Mar 28;100(12):124503. Epub 2008 Mar 28.

    Hugoniot data for helium in the ionization regime.

    Source

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

    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.

    PMID:
    18517873
    [PubMed]

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