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

Hu, S. X.

doi:10.1103/PhysRevLett.119.065001

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

Journal Article · Thu Aug 10 00:00:00 EDT 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.119.065001· OSTI ID:1375435

Hu, S. X. ^[1]

Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics

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.

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Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0001944

OSTI ID:: 1375435

Alternate ID(s):: OSTI ID: 1374768

Report Number(s):: 2017-36, 1349; PRLTAO; 2017-36, 2304, 1349; TRN: US1702795

Journal Information:: Physical Review Letters, Vol. 119, Issue 6; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 46 works

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