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首页> 外文期刊>Physical Review X >Quantum-Mechanical Calculation of Ionization-Potential Lowering in Dense Plasmas
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Quantum-Mechanical Calculation of Ionization-Potential Lowering in Dense Plasmas

机译：密集等离子体中电离电势降低的量子力学计算

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The charged environment within a dense plasma leads to the phenomenon of ionization-potential depression (IPD) for ions embedded in the plasma. Accurate predictions of the IPD effect are of crucial importance for modeling atomic processes occurring within dense plasmas. Several theoretical models have been developed to describe the IPD effect, with frequently discrepant predictions. Only recently, first experiments on IPD in Al plasma have been performed with an x-ray free-electron laser, where their results were found to be in disagreement with the widely used IPD model by Stewart and Pyatt. Another experiment on Al, at the Orion laser, showed disagreement with the model by Ecker and Kr?ll. This controversy shows a strong need for a rigorous and consistent theoretical approach to calculate the IPD effect. Here, we propose such an approach: a two-step Hartree-Fock-Slater model. With this parameter-free model, we can accurately and efficiently describe the experimental Al data and validate the accuracy of standard IPD models. Our model can be a useful tool for calculating atomic properties within dense plasmas with wide-ranging applications to studies on warm dense matter, shock experiments, planetary science, inertial confinement fusion, and nonequilibrium plasmas created with x-ray free-electron lasers.
机译：稠密等离子体中的带电环境导致嵌入等离子体中的离子发生电离势下降（IPD）现象。 IPD效应的准确预测对于模拟在密集等离子体中发生的原子过程至关重要。已经开发了几种理论模型来描述IPD效果，并经常会有不同的预测。直到最近，才用X射线自由电子激光对Al等离子体中的IPD进行了首次实验，发现其结果与Stewart和Pyatt广泛使用的IPD模型不一致。在Orion激光器上进行的另一项关于Al的实验表明，Ecker和Kr？ll与该模型存在分歧。这一争议表明，迫切需要一种严格且一致的理论方法来计算IPD效果。在这里，我们提出了这样一种方法：两步Hartree-Fock-Slater模型。使用此无参数模型，我们可以准确而有效地描述实验Al数据，并验证标准IPD模型的准确性。我们的模型可以成为计算稠密等离子体中原子性质的有用工具，可广泛用于研究热致密物质，冲击实验，行星科学，惯性约束聚变和X射线自由电子激光产生的非平衡等离子体。

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