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引用次数: 0
摘要
空心离子的 X 射线发射在高能量密度研究中具有重大意义,因为可以忽略的不透明性允许从非常致密的物体内部进行研究。本文从纯 ab initio 多配置 Hartree-Fock 模拟(包括精确交换项和有限温度致密等离子体效应)中获得了单 K 壳空位和双 K 壳空位等电子序列的电离势凹陷。结果表明,以空心离子 X 射线跃迁能量图的形式同时表示这些 ab initio 数据,能够识别物质演化和电离动力学的重要步骤。根据 X 射线自由电子激光器泵浦能量的函数绘制等电子序列图,还能使电离势抑对空心离子形成途径的影响可视化。
Hollow ion atomic structure and X-ray emission in dense hot plasmas
Hollow ion X-ray emission is of great interest in high-energy-density research, since negligible opacity allows studies from the interior of very dense objects. In this paper, ionization potential depressions of the isoelectronic sequences for single and double K-shell vacancies are obtained from a pure ab initio multiconfiguration Hartree–Fock simulation including exact exchange terms and finite temperature dense plasma effects. It is demonstrated that the simultaneous representation of these ab initio data in the form of a map of hollow ion X-ray transition energies enables identification of important steps in the matter evolution and ionization dynamics. Mapping along the isoelectronic sequence as a function of the pumping energy of a X-ray free electron laser also enables visualization of the impact of ionization potential depression on the pathways of hollow ion formation.
期刊介绍:
Matter and Radiation at Extremes (MRE), is committed to the publication of original and impactful research and review papers that address extreme states of matter and radiation, and the associated science and technology that are employed to produce and diagnose these conditions in the laboratory. Drivers, targets and diagnostics are included along with related numerical simulation and computational methods. It aims to provide a peer-reviewed platform for the international physics community and promote worldwide dissemination of the latest and impactful research in related fields.