First Principles Calculations of Shock Compressed Fluid Helium

Details First Principles Calculations of Shock Compressed Fluid Helium First Principles Calculations of Shock Compressed Fluid Helium

2006-09-25

arxiv.org/abs/cond-mat/0609640v1

Physics

Condensed Matter

Materials Science

Accepted to publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.97.175501

The properties of hot dense helium at megabar pressures were studied with two first-principles computer simulation techniques, path integral Monte Carlo and density functional molecular dynamics. The simulations predicted that the compressibility of helium is substantially increased by electronic excitations that are present in the hot fluid at thermodynamic equilibrium. A maximum compression ratio of 5.24(4)-fold the initial density was predicted for 360 GPa and 150000 K. This result distinguishes helium from deuterium, for which simulations predicted a maximum compression ratio of 4.3(1). Hugoniot curves for statically precompressed samples are also discussed.

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