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Title: Continuum Lowering and Fermi-Surface Rising in Strongly Coupled and Degenerate Plasmas

Abstract

Here, continuum lowering is a well-known and important physics concept that describes the ionization potential depression (IPD) in plasmas caused by thermal-/pressure-induced ionization of outer-shell electrons. The existing IPD models are often used to characterize plasma conditions and to gauge opacity calculations. Recent precision measurements have revealed deficits in our understanding of continuum lowering in dense hot plasmas. However, these investigations have so far been limited to IPD in strongly coupled but nondegenerate plasmas. Here, we report a first-principles study of the K-edge shifting in both strongly coupled and fully degenerate carbon plasmas, with quantum molecular dynamics (QMD) calculations based on the all-electron density-functional theory (DFT). The resulted K-edge shifting versus plasma density, as a probe to the continuum lowering and the Fermi-surface rising, is found to be significantly different from predictions of existing IPD models. In contrast, a simple model of “single atom in box” (SAIB), developed in this work, accurately predicts K-edge locations as what ab-initio calculations provide.

Authors:
 [1]
  1. Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Research Org.:
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1375435
Alternate Identifier(s):
OSTI ID: 1374768
Report Number(s):
2017-36, 1349
Journal ID: ISSN 0031-9007; PRLTAO; 2017-36, 2304, 1349; TRN: US1702795
Grant/Contract Number:  
NA0001944
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 119; Journal Issue: 6; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Hu, S. X. Continuum Lowering and Fermi-Surface Rising in Strongly Coupled and Degenerate Plasmas. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.119.065001.
Hu, S. X. Continuum Lowering and Fermi-Surface Rising in Strongly Coupled and Degenerate Plasmas. United States. doi:10.1103/PhysRevLett.119.065001.
Hu, S. X. Thu . "Continuum Lowering and Fermi-Surface Rising in Strongly Coupled and Degenerate Plasmas". United States. doi:10.1103/PhysRevLett.119.065001. https://www.osti.gov/servlets/purl/1375435.
@article{osti_1375435,
title = {Continuum Lowering and Fermi-Surface Rising in Strongly Coupled and Degenerate Plasmas},
author = {Hu, S. X.},
abstractNote = {Here, continuum lowering is a well-known and important physics concept that describes the ionization potential depression (IPD) in plasmas caused by thermal-/pressure-induced ionization of outer-shell electrons. The existing IPD models are often used to characterize plasma conditions and to gauge opacity calculations. Recent precision measurements have revealed deficits in our understanding of continuum lowering in dense hot plasmas. However, these investigations have so far been limited to IPD in strongly coupled but nondegenerate plasmas. Here, we report a first-principles study of the K-edge shifting in both strongly coupled and fully degenerate carbon plasmas, with quantum molecular dynamics (QMD) calculations based on the all-electron density-functional theory (DFT). The resulted K-edge shifting versus plasma density, as a probe to the continuum lowering and the Fermi-surface rising, is found to be significantly different from predictions of existing IPD models. In contrast, a simple model of “single atom in box” (SAIB), developed in this work, accurately predicts K-edge locations as what ab-initio calculations provide.},
doi = {10.1103/PhysRevLett.119.065001},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 6,
volume = 119,
place = {United States},
year = {2017},
month = {8}
}

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Cited by: 15 works
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Works referenced in this record:

Generalized Gradient Approximation Made Simple
journal, October 1996

  • Perdew, John P.; Burke, Kieron; Ernzerhof, Matthias
  • Physical Review Letters, Vol. 77, Issue 18, p. 3865-3868
  • DOI: 10.1103/PhysRevLett.77.3865

Detailed analysis of hollow ions spectra from dense matter pumped by X-ray emission of relativistic laser plasma
journal, March 2014

  • Hansen, S. B.; Colgan, J.; Faenov, A. Ya.
  • Physics of Plasmas, Vol. 21, Issue 3
  • DOI: 10.1063/1.4865227

Quantum-Mechanical Calculation of Ionization-Potential Lowering in Dense Plasmas
journal, July 2014


Laboratory measurements of resistivity in warm dense plasmas relevant to the microphysics of brown dwarfs
journal, November 2015

  • Booth, N.; Robinson, A. P. L.; Hakel, P.
  • Nature Communications, Vol. 6, Issue 1
  • DOI: 10.1038/ncomms9742

Density-functional calculations of the liquid deuterium Hugoniot, reshock, and reverberation timing
journal, August 2003


First-principles opacity table of warm dense deuterium for inertial-confinement-fusion applications
journal, September 2014


Dynamical and optical properties of warm dense hydrogen
journal, April 2001


Change in Inertial Confinement Fusion Implosions upon Using an Ab Initio Multiphase DT Equation of State
journal, September 2011


Observations of the Effect of Ionization-Potential Depression in Hot Dense Plasma
journal, June 2013


Calculations of the radiative opacity of laser-produced plasmas
journal, April 1992


Lowering of Ionization Potentials in Plasmas
journal, April 1966

  • Stewart, John C.; Pyatt, Kedar D. , Jr.
  • The Astrophysical Journal, Vol. 144
  • DOI: 10.1086/148714

Dense plasma equation of state model
journal, January 1994

  • Liberman, D.; Albritton, J.
  • Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 51, Issue 1-2
  • DOI: 10.1016/0022-4073(94)90080-9

Temperature determination using K α spectra from M -shell Ti ions
journal, September 2005


Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set
journal, October 1996


Electronic Structure of Warm Dense Copper Studied by Ultrafast X-Ray Absorption Spectroscopy
journal, April 2011


New experimental possibilities for measuring radiative opacity under conditions in the Sun's interior
journal, November 2005


Ab initio molecular-dynamics simulation of the liquid-metal–amorphous-semiconductor transition in germanium
journal, May 1994


New approximation for calculating free-free absorption in hot dense plasmas
journal, December 1996


Quantum molecular dynamics simulations of hot, dense hydrogen
journal, December 1995


Very-high-temperature molecular dynamics
journal, January 2006


Perspectives on high-energy-density physics
journal, May 2009


Ab Initio Simulations of the K -Edge Shift along the Aluminum Hugoniot
journal, October 2008


Strong Coupling and Degeneracy Effects in Inertial Confinement Fusion Implosions
journal, June 2010


Creation and diagnosis of a solid-density plasma with an X-ray free-electron laser
journal, January 2012

  • Vinko, S. M.; Ciricosta, O.; Cho, B. I.
  • Nature, Vol. 482, Issue 7383
  • DOI: 10.1038/nature10746

Ab Initio Determination of Thermal Conductivity of Dense Hydrogen Plasmas
journal, February 2009


X-ray Thomson scattering in high energy density plasmas
journal, December 2009


Dense hydrogen plasma: Comparison between models
journal, September 1997


Ab initiomolecular dynamics for liquid metals
journal, January 1993


Lowering of the Ionization Energy for a Plasma in Thermodynamic Equilibrium
journal, January 1963


A higher-than-predicted measurement of iron opacity at solar interior temperatures
journal, December 2014

  • Bailey, J. E.; Nagayama, T.; Loisel, G. P.
  • Nature, Vol. 517, Issue 7532
  • DOI: 10.1038/nature14048

Thermal Properties of the Inhomogeneous Electron Gas
journal, March 1965


Thermophysical properties of warm dense hydrogen using quantum molecular dynamics simulations
journal, May 2008


Self-consistent field model for condensed matter
journal, December 1979


A plea for a reexamination of ionization potential depression measurements
journal, September 2014


Measurements of continuum lowering in solid-density plasmas created from elements and compounds
journal, May 2016

  • Ciricosta, O.; Vinko, S. M.; Barbrel, B.
  • Nature Communications, Vol. 7, Issue 1
  • DOI: 10.1038/ncomms11713

Exoplanet Habitability
journal, May 2013


Continuum lowering – A new perspective
journal, December 2014


Density functional theory calculations of continuum lowering in strongly coupled plasmas
journal, March 2014

  • Vinko, S. M.; Ciricosta, O.; Wark, J. S.
  • Nature Communications, Vol. 5, Issue 1
  • DOI: 10.1038/ncomms4533

Observations of Continuum Depression in Warm Dense Matter with X-Ray Thomson Scattering
journal, April 2014


Opacities for the solar radiative interior
journal, April 1991

  • Iglesias, C. A.; Rogers, F. J.
  • The Astrophysical Journal, Vol. 371
  • DOI: 10.1086/169902

The Boltzmann Equation in the Theory of Electrical Conduction in Metals
journal, April 1958


Direct Measurements of the Ionization Potential Depression in a Dense Plasma
journal, August 2012


Ab initio study of deuterium in the dissociating regime: Sound speed and transport properties
journal, November 2001


Self-Consistent Equations Including Exchange and Correlation Effects
journal, November 1965