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Dynamic Compression of Hydrogen and Other Small Molecular Fluids at High Pressures

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Title Dynamic Compression of Hydrogen and Other Small Molecular Fluids at High Pressures
Author W. J. Nellis
Publisher Fermi National Accelerator Laboratory (Fermilab)
Release Date 2009
Language English

Content Metadata

Subject Area Physics
Abstract Dynamic compression of molecular fluids using both single-shock (Hugoniot) and multiple-shock compression achieves pressures which range up to several Mbar (100 GPa), compressions up to ten-fold of ambient liquid density, and temperatures up to several 1000 K in degenerate condensed matter. For several diatomic fluids, nonmetal-metal transitions determined by electrical conductivity measurements at densities achieved by multiple-shock compression and pressure-volume Hugoniot curves each have universal systematic behaviors. The extreme conditions are achieved for ~ 100 ns using a two-stage light-gas gun, which accelerates a 20-g projectile to kinetic energies as high as 0.5 MJ. The systematics will be discussed, including the nonmetal-metal transition in fluid hydrogen at 1.4 Mbar and 10-fold compression and the controversial issue of the pressure-volume Hugoniot curve of deuterium near 100 GPa and 4-fold compression.

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