氦原子和离子通过锌的电子碰撞多电离截面
Electron-Impact Multiple Ionization Cross Sections for Atoms and Ions of Helium through Zinc
摘要：
我们编制了一套电子碰撞多重电离（EIMI）截面的天体物理相关的离子。EIMI对非平衡等离子体的电离平衡有重要影响。例如，如果存在电子温度的快速变化或者如果存在非热电子能量分布（诸如卡帕分布），则这可能是重要的。EIMI的截面是需要的，以便在等离子体建模和光谱解释这些过程。在这里，我们描述了我们的比较拟议的半经验公式可用的实验EIMI截面数据。基于这种比较，我们已经内插和外推拟合参数尚未被测量的系统。提供了3466 EIMI截面的拟合参数列表。我们还强调一些尚待解决的未决问题。
英文摘要：
We have compiled a set of electron-impact multiple ionization (EIMI) cross sections for astrophysically relevant ions. EIMI can have a significant effect on the ionization balance of non-equilibrium plasmas. For example, it can be important if there is a rapid change in the electron temperature or if there is a non-thermal electron energy distribution, such as a kappa distribution. Cross sections for EIMI are needed in order to account for these processes in plasma modeling and for spectroscopic interpretation. Here, we describe our comparison of proposed semiempirical formulae to the available experimental EIMI cross section data. Based on this comparison, we have interpolated and extrapolated fitting parameters to systems that have not yet been measured. A tabulation of the fit parameters is provided for 3466 EIMI cross sections. We also highlight some outstanding issues that remain to be resolved.
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