Journal
PHYSICAL REVIEW B
Volume 79, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.014112
Keywords
deuterium; equations of state; impedance matching; shock wave effects
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The compression (eta) of liquid deuterium between 45 and 220 GPa under laser-driven shock loading has been measured using impedance matching to an aluminum (Al) standard. An Al impedance-match model derived from a best fit to absolute Hugoniot data has been used to quantify and minimize the systematic errors caused by uncertainties in the high-pressure Al equation of state. In deuterium below 100 GPa results show that eta similar or equal to 4.2, in agreement with previous impedance-match data from magnetically driven flyer and convergent-explosive shock wave experiments; between 100 and 220 GPa eta reaches a maximum of similar to 5.0, which is less than the sixfold compression observed on the earliest laser-shock experiments but greater than expected from simple extrapolations of lower-pressure data. Previous laser-driven double shock results are found to be in good agreement with these single shock measurements over the entire range under study. Both sets of laser-shock data indicate that deuterium undergoes an abrupt increase in compression at around 110 GPa.
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