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<p>Dense plasma environment affects the electronic structure of ions via variations of the microscopic electrical fields, also known as <i>plasma screening</i>. This effect can be either estimated by simplified analytical models, or by computationally expensive and to date unverified numerical calculations. We have experimentally quantified plasma screening from the energy shifts of the bound-bound transitions in matter driven by the x-ray free electron laser (XFEL). This was enabled by identification of detailed electronic configurations of the observed K<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\upalpha\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">α</mi> </math></EquationSource> </InlineEquation>, K<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\upbeta\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">β</mi> </math></EquationSource> </InlineEquation> and K<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\upgamma\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">γ</mi> </math></EquationSource> </InlineEquation> lines. This work paves the way for improving plasma screening models including connected effects like ionization potential depression and continuum lowering, which will advance the understanding of atomic physics in the Warm Dense Matter regime.</p>

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Plasma screening in mid-charged ions observed by K-shell line emission

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月10日

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  • M. Šmíd,
  • O. S. Humphries,
  • C. Baehtz,
  • V. Bouffetier,
  • E. Brambrink,
  • T. Burian,
  • V. Cerantola,
  • M. S. Cho,
  • T. E. Cowan,
  • L. Gaus,
  • M. F. Gu,
  • V. Hájková,
  • L. Juha,
  • J. Kaa,
  • Z. Konopkova,
  • M. Kozlová,
  • H. P. Le,
  • M. Makita,
  • X. Pan,
  • T. R. Preston,
  • A. Schropp,
  • J.-P. Schwinkendorf,
  • H. A. Scott,
  • R. Štefaníková,
  • J. Vorberger,
  • W. Wang,
  • U. Zastrau,
  • K. Falk

摘要

Dense plasma environment affects the electronic structure of ions via variations of the microscopic electrical fields, also known as plasma screening. This effect can be either estimated by simplified analytical models, or by computationally expensive and to date unverified numerical calculations. We have experimentally quantified plasma screening from the energy shifts of the bound-bound transitions in matter driven by the x-ray free electron laser (XFEL). This was enabled by identification of detailed electronic configurations of the observed K \(\upalpha\) α , K \(\upbeta\) β and K \(\upgamma\) γ lines. This work paves the way for improving plasma screening models including connected effects like ionization potential depression and continuum lowering, which will advance the understanding of atomic physics in the Warm Dense Matter regime.