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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
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Thomson scattering from dense inhomogeneous plasmas.

T-N Beuermann1, R Redmer1, Th Bornath1

  • 1Institut für Physik, Universität Rostock, D-18051 Rostock, Germany.

Physical Review. E
|June 20, 2019
PubMed
Summary

X-ray Thomson scattering reveals how spatial inhomogeneities in warm dense matter affect plasma properties. These effects alter spectral features, complicating temperature measurements from detailed balance relations.

Area of Science:

  • Plasma Physics
  • X-ray Science
  • Materials Science

Background:

  • X-ray Thomson scattering (XT S) experiments probe high-density systems.
  • Pump-probe experiments reveal excitation and relaxation dynamics in dense plasmas.
  • Local thermodynamic equilibrium may fail for short timescales.

Purpose of the Study:

  • Investigate the impact of spatial inhomogeneities on Thomson scattering spectra in warm dense matter.
  • Generalize existing theories for inhomogeneous plasmas.
  • Analyze deviations from local thermodynamic equilibrium.

Main Methods:

  • Utilized a gradient expansion within real-time Green's-functions theory.
  • Extended previous theoretical approaches for inhomogeneous plasmas.

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  • Focused on the collective scattering regime.

    • Main Results:

    • Spatial inhomogeneities significantly modify Thomson scattering spectra.
    • A first-order gradient expansion determines the plasmon dispersion relation.
    • The ratio of plasmon peak heights is altered, hindering simple temperature estimation.

    Conclusions:

    • Spatial inhomogeneities are crucial for understanding Thomson scattering in warm dense matter.
    • Standard detailed balance relations may not apply due to these inhomogeneities.
    • Advanced theoretical treatments are necessary for accurate plasma characterization.