Density-dependent Lines of One- and Two-electron Ions in Diagnostics of Laboratory plasma. I. The rates of collision relaxation of excited levels
Density-dependent Lines of One- and Two-electron Ions in Diagnostics of Laboratory plasma. I. The rates of collision relaxation of excited levels
复制标题
实验室等离子体诊断中的一电子和二电子离子的密度依赖性谱线。
DOI：
10.1088/0031-8949/16/3-4/010
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发表时间：
1977
期刊：
影响因子：
2.9
通讯作者：
A. Vinogradov
中科院分区：
文献类型：
--
作者：
V. P. Shevelko;I. Skobelev;A. Vinogradov
近年来迅速发展的具有惯性等离子体约束的等离子体装置，例如激光产生等离子体、爆炸线、等离子体聚焦等，似乎是远紫外和X射线区域中非常密集的谱线辐射源。这种辐射的分析为等离子体诊断提供了一个良好的工具，电子密度高达 1022 cm-3。在这项由两部分组成的工作中，我们考虑了热致密等离子体中谱线的形成机制。密度诊断的关键点是，对于某些离子水平，碰撞弛豫速率与辐射衰变具有相同的数量级。因此，这些能级产生的谱线强度显示出对电子密度的强烈依赖性，这使得诊断成为可能。在第一篇论文中，重点是计算由电子或离子碰撞引起的近距离离子能级之间的跃迁速率，这通常对碰撞弛豫常数做出主要贡献。还考虑了等离子体极化效应对致密等离子体中碰撞频率的影响。在第二篇论文中，将考虑电子密度 1018 cm-3 ≤ N ≤ 1024 cm-3 和离子电荷 10 ≤ Z ≤ 19 时类氢、类氦和类氧离子谱线的形成。
Plasma devices with inertial plasma confinement such as laser produced plasmas, exploding wires, plasma focus, etc., which have been rapidly developed during recent years, appear to be very intensive sources of spectral line radiation in far UV and X-ray regions. Analysis of this radiation provides a good tool for plasma diagnostics with very high electron densities up to 1022 cm-3. In this work, consisting of two parts, we consider the mechanism of the formation of spectral lines in hot and dense plasma. The key point for density diagnostics is the fact that for some ion levels the rate of collisional relaxation has the same order of magnitude as the radiative decay. Thus the intensities of spectral lines arising from these levels show a strong dependence on electron density which makes diagnostics possible. In the first paper, emphasis is laid on the calculation of rates of transition between close ion levels induced by electron or ion impact, which usually gives the main contribution to the collisional relaxation constants. The influence of plasma polarization effects on the collision frequency in a dense plasma is also considered. In a second paper, the formation of spectral lines of hydrogen-like, helium-like and oxygen-like ions will be considered for electron density 1018 cm-3 ≤ N ≤ 1024 cm-3 and the ion charge 10 ≤ Z ≤ 19.