Lin Chengliang, Röpke Gerd, Kraeft Wolf-Dietrich, Reinholz Heidi
Universität Rostock, Institut für Physik, 18051 Rostock, Germany.
University of Western Australia School of Physics, WA 6009 Crawley, Australia.
Phys Rev E. 2017 Jul;96(1-1):013202. doi: 10.1103/PhysRevE.96.013202. Epub 2017 Jul 6.
The properties of a bound electron system immersed in a plasma environment are strongly modified by the surrounding plasma. The modification of an essential quantity, the ionization energy, is described by the electronic and ionic self-energies, including dynamical screening within the framework of the quantum statistical theory. Introducing the ionic dynamical structure factor as the indicator for the ionic microfield, we demonstrate that ionic correlations and fluctuations play a critical role in determining the ionization potential depression. This is, in particular, true for mixtures of different ions with large mass and charge asymmetry. The ionization potential depression is calculated for dense aluminum plasmas as well as for a CH plasma and compared to the experimental data and more phenomenological approaches used so far.
浸没在等离子体环境中的束缚电子系统的性质会受到周围等离子体的强烈影响。通过电子和离子自能，包括在量子统计理论框架内的动态屏蔽，描述了一个基本量——电离能的变化。引入离子动态结构因子作为离子微场的指标，我们证明离子关联和涨落在确定电离势降低方面起着关键作用。对于具有大质量和电荷不对称性的不同离子混合物来说尤其如此。计算了致密铝等离子体以及CH等离子体的电离势降低，并与实验数据以及迄今为止使用的更多唯象方法进行了比较。
