X-ray transition and K-edge energies in dense finite-temperature plasmas: Challenges of a generalized approach with spectroscopic precision

Li X.; Rosmej F. B.

doi:10.1063/5.0235418

Volume 10 Issue 2

Mar. 2025

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Li X., Rosmej F. B.. X-ray transition and K-edge energies in dense finite-temperature plasmas: Challenges of a generalized approach with spectroscopic precision[J]. Matter and Radiation at Extremes, 2025, 10(2): 027201. doi: 10.1063/5.0235418

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Li X., Rosmej F. B.. X-ray transition and K-edge energies in dense finite-temperature plasmas: Challenges of a generalized approach with spectroscopic precision[J]. Matter and Radiation at Extremes, 2025, 10(2): 027201. doi: 10.1063/5.0235418

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X-ray transition and K-edge energies in dense finite-temperature plasmas: Challenges of a generalized approach with spectroscopic precision

doi: 10.1063/5.0235418

Li X.^{1
,
,
,},
Rosmej F. B.^{2, 3
,
,
,}

1.
Key Laboratory of Ultra-Intense Laser Science and Technology, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS), Shanghai 201800, China
2.
Sorbonne University, Faculty of Science and Engineering, UMR 7605, case128, 4 Place Jussieu, F-75252 Paris Cedex 05, France
3.
LULI, Ecole Polytechnique, Laboratoire pour l’Utilisation des Lasers Intenses, Physique Atomique dans les Plasmas Denses, F-91128 Palaiseau, France

More Information

Corresponding author: a)Authors to whom correspondence should be addressed: xiangdong_li@siom.ac.cn and frank.rosmej@sorbonne-universite.fr
Received Date: 2024-08-27
Accepted Date: 2024-12-24

Available Online: 2025-03-01

Publish Date: 2025-03-01

Abstract

Abstract

The capacity to predict X-ray transition and K-edge energies in dense finite-temperature plasmas with high precision is of primary importance for atomic physics of matter under extreme conditions. The dual characteristics of bound and continuum states in dense matter are modeled by a valence-band-like structure in a generalized ion-sphere approach with states that are either bound, free, or mixed. The self-consistent combination of this model with the Dirac wave equations of multielectron bound states allows one to fully respect the Pauli principle and to take into account the exact nonlocal exchange terms. The generalized method allows very high precision without implication of calibration shifts and scaling parameters and therefore has predictive power. This leads to new insights in the analysis of various data. The simple ionization model representing the K-edge is generalized to excitation–ionization phenomena resulting in an advanced interpretation of ionization depression data in near-solid-density plasmas. The model predicts scaling relations along the isoelectronic sequences and the existence of bound M-states that are in excellent agreement with experimental data, whereas other methods have failed. The application to unexplained data from compound materials also gives good agreement without the need to invoke any additional assumptions in the generalized model, whereas other methods have lacked consistency.

Conflict of Interest
The authors have no conflicts to disclose.
X.L. and F.B.R. contributed to the simulations and analysis of the data.
X. Li: Conceptualization (equal); Data curation (equal); Formal analysis (equal); Investigation (equal); Methodology (equal); Validation (equal); Visualization (equal); Writing – original draft (equal); Writing – review & editing (equal). F. B. Rosmej: Conceptualization (equal); Data curation (equal); Formal analysis (equal); Investigation (equal); Methodology (equal); Validation (equal); Visualization (equal); Writing – original draft (equal); Writing – review & editing (equal).
Author Contributions
The data that support the findings of this study are available from the corresponding authors upon reasonable request.

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References(70)

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