Reflected shock experiments on the equation-of-state properties of liquid deuterium at 100–600 GPa (1–6 Mbar)

Mostovych, A. N.; Chan, Y.; Lehecha, T.; Phillips, Lee; Schmitt, A. J.; Sethian, J. D.

doi:10.1063/1.1359444

Cited by 28 publications

(10 citation statements)

References 24 publications

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“…Ab initio methods predict a secondary shock pressure about 25% lower than measured experimentally. This is outside of the experimental error bars reported in [21] (which have increased compared to [9]). Only for u s1 = 25 km s −1 is agreement found.…”

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confidence: 58%

Calculation of a Deuterium Double Shock Hugoniot fromAb InitioSimulations

et al. 2001

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We calculate the equation of state of dense deuterium with two ab initio simulation techniques, path integral Monte Carlo and density functional theory molecular dynamics, in the density range of 0.67 < or = rho < or = 1.60 g cm(-3). We derive the double shock Hugoniot and compare with the recent laser-driven double shock wave experiments by Mostovych et al. [Phys. Rev. Lett. 85, 3870 (2000)]. We find excellent agreement between the two types of microscopic simulations, but a significant discrepancy with the laser-driven shock measurements.

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confidence: 58%

Calculation of a Deuterium Double Shock Hugoniot fromAb InitioSimulations

et al. 2001

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“…Although early laser-driven double shock measurements on the Nike laser 42,43 using an aluminum anvil appeared to be consistent with a soft EOS, subsequent higher precision double shock data obtained on the Omega laser 32 using a quartz anvil indicated a stiff EOS for first-shock pressures below ϳ100 GPa and above ϳ200 GPa, and an "intermediate" EOS suggestive of ϳ 5 in between. The Omega experiments provide a rigorous test of the deuterium compressibility ͑albeit in the double shock state͒ because the data are independent of models for the standard.…”

Section: B Previous Experimentsmentioning

confidence: 95%

Laser-driven single shock compression of fluid deuterium from 45 to 220 GPa

et al. 2009

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The compression ͑͒ of liquid deuterium between 45 and 220 GPa under laser-driven shock loading has been measured using impedance matching to an aluminum ͑Al͒ 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 Ӎ 4.2, in agreement with previous impedance-match data from magnetically driven flyer and convergentexplosive shock wave experiments; between 100 and 220 GPa reaches a maximum of ϳ5.0, 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 lasershock data indicate that deuterium undergoes an abrupt increase in compression at around 110 GPa.Our results show that between 45 and 101 GPa Ӎ 4.2, in good agreement with previous magnetic-and explosivedriven impedance-matching measurements. This indicates that the discrepancy between earlier experiments in this range was due to the differences between radiography and impedance-matching measurement techniques and not to any inherent differences between shock platforms. At around 110 GPa, the compression increases sharply to a maximum of Ӎ 5.0, remaining between 4.5 and fivefold compression up to 220 GPa. This is in excellent agreement with previous laser-driven double shock measurements. 32 Whether or not PHYSICAL REVIEW B 79, 014112 ͑2009͒

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“…This temperature is smaller than the Fermi temperature of the metallic fluid (∼ 16 eV), the samples are a degenerate metal. Improvement in compression (up to ∼ 12-fold) has been reported in reflected-shock experiments where the second shock occurs at ∼ 100GP a along the primary Hugoniot line (Mostovych et al, 2001(Mostovych et al, , 2000. Pressures up to 600 GPa were reported.…”

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confidence: 82%

“…WPMD (gray right-triangle) (Knaup et al, 2003) 4.3 ± 0.1 also in disagreement with laser-driven shock experiments. In a subsequent study combining RPIMC (T>10 5 K) and first-principles MD (T<10 5 K) simulation techniques , the secondary Hugoniot was investigated and results compared with the experimental data of Mostovych et al (Mostovych et al, 2001(Mostovych et al, , 2000. Even in this case it was found that RPIMC and AIMD were in essential agreement but both at variance with the secondary Hugoniot from laser-driven experiments.…”

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confidence: 87%

The properties of hydrogen and helium under extreme conditions

McMahon¹,

Morales²,

Pierleoni³

et al. 2012

Rev. Mod. Phys.

478

415

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Hydrogen and helium are the most abundant elements in the universe and, in principle, are the simplest elements. Nonetheless, they display remarkable properties under pressure that have fascinated theoreticians and experimentalists for over a century. Recent advances in computational methods have made it possible to elucidate many of these properties. We review some of the computational methods that have been applied to dense hydrogen and helium in recent years, mainly those that perform a simulation directly from the physical picture of electrons and ions; primarily, those based on density functional theory and quantum Monte Carlo methods. We then discuss the predictions from such methods as applied to the phase diagram of hydrogen, including the solid and fluid phases, with particular focus on the crystal structures, the liquidliquid transition and comparison of the results with experimental shock-wave data. We then discuss predictions of ordered quantum states, including a possible low-temperature fluid and high-temperature superconductivity in the atomic state. We also briefly discuss pure helium, and then focus on hydrogen-helium mixtures, with particular focus on properties of relevance to planetary science.

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Reflected shock experiments on the equation-of-state properties of liquid deuterium at 100–600 GPa (1–6 Mbar)

Cited by 28 publications

References 24 publications

Calculation of a Deuterium Double Shock Hugoniot fromAb InitioSimulations

Calculation of a Deuterium Double Shock Hugoniot fromAb InitioSimulations

Laser-driven single shock compression of fluid deuterium from 45 to 220 GPa

The properties of hydrogen and helium under extreme conditions

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