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Title: X-ray scattering measurements of dissociation-induced metallization of dynamically compressed deuterium

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms11189· OSTI ID:1234196
 [1];  [2];  [2];  [3];  [2];  [2];  [4];  [5];  [5];  [5];  [5];  [6];  [2];  [2];  [2];  [7];  [4]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Los Angeles, CA (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Rockstock Univ., Rockstock (Germany). Inst. fur Physik
  6. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  7. Univ. of California, Berkeley, CA (United States)

Hydrogen, the simplest element in the universe, has a surprisingly complex phase diagram. Because of applications to planetary science, inertial confinement fusion and fundamental physics, its high-pressure properties have been the subject of intense study over the past two decades. While sophisticated static experiments have probed hydrogen’s structure at ever higher pressures, studies examining the higher-temperature regime using dynamic compression have mostly been limited to optical measurement techniques. Here we present spectrally resolved x-ray scattering measurements from plasmons in dynamically compressed deuterium. Combined with Compton scattering, and velocity interferometry to determine shock pressure and mass density, this allows us to extract ionization state as a function of compression. As a result, the onset of ionization occurs close in pressure to where density functional theory-molecular dynamics (DFT-MD) simulations show molecular dissociation, suggesting hydrogen transitions from a molecular and insulating fluid to a conducting state without passing through an intermediate atomic phase.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC02-76SF00515; AC52- 07NA27344; 11-ER- 050; AC52-07NA27344; AC04-94AL85000
OSTI ID:
1234196
Alternate ID(s):
OSTI ID: 1260480; OSTI ID: 1266257
Report Number(s):
SLAC-PUB-16446; LLNL-JRNL-690581
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Warming Up Density Functional Theory book November 2017
Progress toward a self-consistent set of 1D ignition capsule metrics in ICF journal December 2018
Measurement of ionic structure in isochorically heated graphite from X-ray Thomson scattering journal February 2019
Phase Diagram of Hydrogen and a Hydrogen-Helium Mixture at Planetary Conditions by Quantum Monte Carlo Simulations text January 2018
Phase diagram of hydrogen and a hydrogen-helium mixture at planetary conditions by Quantum Monte Carlo simulations text January 2017
A viscous quantum hydrodynamics model based on dynamic density functional theory journal November 2017
Understanding dense hydrogen at planetary conditions journal September 2020