电子与辐射原子之间的碰撞在等离子体中拓宽了谱线的吸收和发射线。高密度还引入了筛选和压力电离效应，这些效应扭曲了束缚电子和自由电子的波函数。为了研究等离子体效应如何影响谱线的电子展宽，本文利用平均原子（AA）模型中的电子波函数来计算B III 2p-2s跃迁在T=10 eV时，质量密度从ρ=10^-4-0.4 g/cc范围内的线宽。计算方法采用冲击近似，使线宽可以表示为电子碰撞截面和干涉项。与使用库仑自由波函数的其他相同计算相比，AA方法在足够高密度下通过引入筛选和压力电离束缚态，修改了截面和最终的线宽。筛选在低能和电子激发阈值附近降低了截面，而压力电离束缚态在连续谱中引入了共振。因此，随着密度的增加，AA与库仑计算之间的相对线宽因筛选而总体减小，但在某些区间内因压力电离而出现急剧增加。AA结果还与通过相互作用势引入筛选的常见方法以及使用Bethe公式计算非弹性电子碰撞截面的简化模型进行了比较。
英文摘要：
Collisions between electrons and radiating atoms broaden spectral absorption and emission lines in dense plasmas. High densities also introduce screening and pressure ionization effects that distort the wavefunctions of both bound and free electrons. In order to study how dense plasma effects influence the electron broadening of spectral lines, this paper incorporates electron wavefunctions from an average-atom (AA) model to calculate the line width of the B III $2p-2s$ transition at $T = 10$ eV for mass densities ranging from $ρ=10^{-4}-0.4$ g/cc. The calculation method uses the impact approximation, allowing the line width to be written in terms of electron-collision cross sections and an interference term. Compared to an otherwise identical calculation that uses Coulomb free wavefunctions, the AA method is found to modify both the cross sections and the resulting line width at sufficiently high density by introducing screening and pressure ionized bound states. Screening lowers the cross sections at low energies and near electron excitation thresholds, while pressure ionized bound states introduce resonances into the continuum. Thus, as the density increases, the relative line width between the AA and Coulomb calculations follows a general decrease because of screening, with sharp increases at various intervals due to pressure ionization. The AA results are also compared with a common approach to introduce screening through the interaction potential and reduced models that use the Bethe formula for the inelastic electron-collision cross sections.
Plasma Screening Effects in Stark Broadening: A Fully Relativistic Close-Coupling Approach
College of Science, Xi’an University of Science and Technology（西安科技大学理学院）；National Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics（计算物理国家重点实验室，应用物理与计算数学研究所）；HEDPS, Center for Applied Physics and Technology, Peking University（高能密度物理研究中心，应用物理与技术中心，北京大学）；College of Science, Xi’an University of Architecture and Technology（西安建筑科技大学理学院）
Plasma screening in mid-charged ions observed by K-shell line emission
Institute of Physics, Academy of Sciences of the Czech Republic（捷克科学院物理研究所）；Lawrence Livermore National Laboratory（劳伦斯利弗莫尔国家实验室）；Space Science Laboratory, University of California, Berkeley（加州大学伯克利分校空间科学实验室）；Institute of Plasma Physics of the CAS（捷克科学院等离子体物理研究所）；Centre for X-ray and Nano Science CXNS, Deutsches Elektronen-Synchrotron DESY（德国电子同步辐射中心X射线与纳米科学中心）
Ionization potential depression and Pauli blocking in degenerate plasmas at extreme densities
新设施在密度非常高的极端条件下探索温暖的稠密物质（WDM）（例如，密度高达50 g cm $^{-3}$的碳），使得电子甚至在100 eV的温度下也是简并的。而在非简并区的相关效应，如德拜屏蔽和它的改进是相关的电离势下降（IPD），新的影响，必须考虑在简并等离子体。除了Fock位移的自能，束缚态泡利阻塞变得重要的密度增加。考虑到这些简并效应，导致电离电位降低，电离度更高。IPD的标准方法，如Stewart-Pyatt和广泛使用的不透明度表（例如，OPAL）不包含泡利阻塞效应的束缚态，使他们无法解释实验与WDM在高密度区。作为例子，给出了碳等离子体电离度的计算结果。
The virial expansion of the Hydrogen equation of state in comparison to PIMC simulations: the quasiparticle concept, IPD, and ionization degree
Institute of Physics, University of Rostock（罗斯托克大学物理研究所）；National Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics（计算物理国家重点实验室，应用物理与计算数学研究所）；Institute of Physics, Humboldt University Berlin（柏林洪堡大学物理研究所）
