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Title: Measurements of continuum lowering in solid-density plasmas created from elements and compounds

The effect of a dense plasma environment on the energy levels of an embedded ion is usually described in terms of the lowering of its continuum level. For strongly coupled plasmas, the phenomenon is intimately related to the equation of state; hence, an accurate treatment is crucial for most astrophysical and inertial-fusion applications, where the case of plasma mixtures is of particular interest. In this study, we present an experiment showing that the standard density-dependent analytical models are inadequate to describe solid-density plasmas at the temperatures studied, where the reduction of the binding energies for a given species is unaffected by the different plasma environment (ion density) in either the element or compounds of that species, and can be accurately estimated by calculations only involving the energy levels of an isolated neutral atom. Lastly, the results have implications for the standard approaches to the equation of state calculations.
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  1. Univ. of Oxford (United Kingdom)
  2. UC Berkeley, LeConte Hall, Berkeley, California (United States)
  3. Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic). Inst. of Physics
  4. Institute for Basic Science (IBS), Gwangju (Korea); Gwangju Inst. of Science and Technology (Korea, Republic of)
  5. Atomic and Molecular Data Unit, Nuclear Data Section, Vienna (Austria)
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  8. Univ. of California, Berkeley, CA (United States)
  9. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  10. SLAC National Accelerator Lab., Menlo Park, CA (United States); Friedrich Schiller Univ., Jena (Germany)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States