Extended X-ray Absorption Fine Structure (EXAFS) as a Probe of Temperature and Density in Fe Under Shock-Ramp Compression
ORAL
Abstract
Probing the behavior of iron under the extreme conditions of Earth's core requires innovative experimental techniques. At the Omega EP laser facility, we employed shock-ramp compression to access off-Hugoniot states of Fe at pressures exceeding 400 GPa. Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy was used to extract local atomic structure and temperature information under these conditions. By combining EXAFS data with velocity interferometry (VISAR) measurements, we determined the pressure, density and thermal state of Fe near melting. Our results provide a constraint for the melting line at these extreme conditions. This study demonstrates the effectiveness of EXAFS as a diagnostic tool for investigating temperature under dynamic compression.
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Presenters
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Yuan Ping
Lawrence Livermore National Laboratory
Authors
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Yuan Ping
Lawrence Livermore National Laboratory
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Amy L Coleman
Lawrence Livermore National Laboratory
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Stanimir A Bonev
Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab
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Andrew Krygier
Lawrence Livermore National Laboratory
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Hong Sio
Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory
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Federica Coppari
Lawrence Livermore National Laboratory
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David A Chin
Laboratory for Laser Energetics, University of Rochester
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Matthew Edward Signor
University of Rochester
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J. Ryan R Rygg
Laboratory for Laser Energetics, University of Rochester
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Gilbert W Collins
University of Rochester, Laboratory for Laser Energetics
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Jon H Eggert
Lawrence Livermore National Laboratory