Journal
PHYSICAL REVIEW B
Volume 92, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.024108
Keywords
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Funding
- French Agence Nationale de la Recherche (ANR)
- ANR IRONFEL
- Planetlab
- DOE Office of Science, Fusion Energy Science [SF00515]
- LCLS, a National User Facility
- Grants-in-Aid for Scientific Research [15K13609] Funding Source: KAKEN
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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 (+/- 50) and 10 800 K (+/- 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 (+/- 29) and 5680 K (+/- 700) along the principal Fe Hugoniot.
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