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Harmand, M.; Ravasio, A.; Mazevet, S.; Bouchet, J.; Denoeud, A.; Dorchies, F.; Feng, Y.; Fourment, C.; Galtier, E.; Gaudin, J.; Guyot, F.; Kodama, R.; Koenig, M.; Lee, H. J.; Miyanishi, K.; Morard, G.; Musella, R.; Nagler, B.; Nakatsutsumi, M.; Ozaki, N.; Recoules, V.; Toleikis, S.; Vinci, T.; Zastrau, U.; Zhu, D.; Benuzzi-Mounaix, A.
Physical review. B, Condensed matter and materials physics, 07/2015, Letnik: 92, Številka: 2Journal Article
Taking advantage of the new opportunities provided by x-ray free electron laser (FEL) sources when coupled to a long laser pulse as available at the Linear Coherent Light Source (LCLS), we have performed x-ray absorption near-edge spectroscopy (XANES) of laser shock compressed iron up to 420 GPa (+ or -50) and 10 800 K (+ or -1390). Visible diagnostics coupled with hydrodynamic simulations were used to infer the thermodynamical conditions along the Hugoniot and the release adiabat. A modification of the pre-edge feature at 7.12 keV in the XANES spectra is observed above pressures of 260 GPa along the Hugoniot. Comparing with ab initio calculations and with previous laser-heated diamond cell data, we propose that such changes in the XANES pre-edge could be a signature of molten iron. This interpretation then suggests that iron is molten at pressures and temperatures higher than 260 GPa (+ or -29) and 5680 K (+ or -700) along the principal Fe Hugoniot.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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