Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.065001
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Funding
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- Laboratory Directed Research and Development [11-ERD-050]
- National Laboratory User Facility
- Engineering and Physical Sciences Research Council [EP/D062837/1, EP/I028994/1] Funding Source: researchfish
- EPSRC [EP/D062837/1, EP/I028994/1] Funding Source: UKRI
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The strong ion-ion correlation peak characteristic of warm dense matter (WDM) is observed for the first time using simultaneous angularly, temporally, and spectrally resolved x-ray scattering measurements in laser-driven shock-compressed aluminum. Laser-produced molybdenum x-ray line emission at an energy of 17.9 keV is employed to probe aluminum compressed to a density of rho > 8 g/cm(3). We observe a well pronounced peak in the static structure factor at a wave number of k = 4.0 angstrom(-1). The measurements of the magnitude and position of this correlation peak are precise enough to test different theoretical models for the ion structure and show that only models taking the complex interaction in WDM into account agree with the data. This also demonstrates a new highly accurate diagnostic to directly measure the state of compression of warm dense matter. DOI: 10.1103/PhysRevLett.110.065001
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