The principal Hugoniot for liquid hydrogen was obtained up to 55 GPa underlaser-driven shock loading. Pressure and density of compressed hydrogen weredetermined by impedance-matching to a quartz standard. The shock temperaturewas independently measured from the brightness of the shock front. Hugoniotdata of hydrogen provide a good benchmark to modern theories of condensedmatter. The initial number density of liquid hydrogen is lower than that forliquid deuterium, and this results in shock compressed hydrogen having a highercompression and higher temperature than deuterium at the same shock pressure.
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