arXiv 1402.29642014-02-12physics.atom-ph

存储高电荷态离子的电子碰撞电离

Electron Impact Ionization of Stored Highly Charged Ions

Michael Hahn

备注：: Accepted for Journal of Physics Conference Series
DOI：: 10.1088/1742-6596/488/1/012050

摘要：

为了解释天体物理和实验室中碰撞电离等离子体的光谱，需要精确的电子碰撞电离（EII）截面数据。这种等离子体的模型和光谱诊断依赖于精确的电离平衡计算，这反过来又取决于EII和电子-离子复合的基本速率。EII测量已经进行了使用TSR储存环位于德国海德堡的马克斯-普朗克研究所fuer Kernphysik。储存环测量在很大程度上是免费的亚稳态污染，从而在明确的EII数据，不像是遇到其他实验几何。由于对每个离子进行实验是不切实际的，理论必须提供大量必要的EII数据。为了指导理论，TSR实验专注于为每个等电子序列提供至少一个测量。EII数据已被测量的离子从13个等电子序列：锂类硅和氯，铍类硫，B类镁，和F类通过K类铁。这些实验结果为EII理论提供了一个重要的基准。

英文摘要：

Accurate cross section data for electron impact ionization (EII) are needed in order to interpret the spectra of collisionally ionized plasmas both in astrophysics and in the laboratory. Models and spectroscopic diagnostics of such plasmas rely on accurate ionization balance calculations, which depend, in turn, on the underlying rates for EII and electron-ion recombination. EII measurements have been carried out using the TSR storage ring located at the Max-Planck-Institut fuer Kernphysik in Heidelberg, Germany. Storage ring measurements are largely free of metastable contamination, resulting in unambiguous EII data, unlike what is encountered with other experimental geometries. As it is impractical to perform experiments for every ion, theory must provide the bulk of the necessary EII data. In order to guide theory, TSR experiments have focused on providing at least one measurement for every isoelectronic sequence. EII data have been measured for ions from 13 isoelectronic sequences: Li-like silicon and chlorine, Be-like sulfur, B-like magnesium, and F-like through K-like iron. These experimental results provide an important benchmark for EII theory.

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