Measurements of continuum lowering in solid-density plasmas created from elements and compounds.
Measurements of continuum lowering in solid-density plasmas created from elements and compounds.
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DOI：
10.1038/ncomms11713
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发表时间：
2016-05-23
影响因子：
16.6
通讯作者：
Wark JS
中科院分区：
文献类型：
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作者：
Ciricosta O;Vinko SM;Barbrel B;Rackstraw DS;Preston TR;Burian T;Chalupský J;Cho BI;Chung HK;Dakovski GL;Engelhorn K;Hájková V;Heimann P;Holmes M;Juha L;Krzywinski J;Lee RW;Toleikis S;Turner JJ;Zastrau U;Wark JS
致密等离子体环境对嵌入离子能级的影响通常用连续能级的降低来描述。对于强耦合等离子体，这种现象与状态方程密切相关；因此，对于大多数天体物理学和惯性聚变应用来说，精确的处理是至关重要的，在这些应用中，等离子体混合物的情况特别有趣。在这里，我们提出了一个实验，表明标准的密度依赖分析模型不足以描述所研究温度下的固体密度等离子体，其中给定物种的结合能的减少不受该物种的元素或化合物的不同等离子体环境（离子密度）的影响，并且可以通过计算精确估计仅涉及孤立中性原子的能级。这些结果对状态方程计算的标准方法具有启示意义。致密等离子体环境对离子能级的影响通常用离子连续能级的降低来描述。在这里，作者提出了一个等弦加热实验来测量和比较单种等离子体和混合等离子体的连续降低，为模型提供见解。
The effect of a dense plasma environment on the energy levels of an embedded ion is usually described in terms of the lowering of its continuum level. For strongly coupled plasmas, the phenomenon is intimately related to the equation of state; hence, an accurate treatment is crucial for most astrophysical and inertial-fusion applications, where the case of plasma mixtures is of particular interest. Here we present an experiment showing that the standard density-dependent analytical models are inadequate to describe solid-density plasmas at the temperatures studied, where the reduction of the binding energies for a given species is unaffected by the different plasma environment (ion density) in either the element or compounds of that species, and can be accurately estimated by calculations only involving the energy levels of an isolated neutral atom. The results have implications for the standard approaches to the equation of state calculations. The effect of dense plasma environment on the energy levels of an ion is usually described in terms of a lowering of its continuum level. Here the authors present an isochoric-heating experiment to measure and compare continuum lowering in single-species and mixture plasmas to provide insights for models.