Theory of excitation of He-like and Li-like atomic sublevels by directive electrons: application to X-ray line polarisation
Theory of excitation of He-like and Li-like atomic sublevels by directive electrons: application to X-ray line polarisation
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DOI：
10.1088/0022-3700/20/16/028
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发表时间：
1987-08
期刊：
影响因子：
--
通讯作者：
M. Inal;J. Dubau
中科院分区：
文献类型：
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作者：
M. Inal;J. Dubau
热等离子体中高能电子的轴对称角分布的存在可以通过测量从多电荷离子的碰撞激发能级发射的X射线线的线性偏振来检测。本文计算了在太阳耀斑和托卡马克软X射线辐射中观测到的Fe ~（24）+共振线和Fe ~（23）+内壳层激发伴线的线偏振度。碰撞强度激发上线磁子级计算使用扭曲波方法的电子碰撞能量范围高达20倍的激发阈值。它示出了如何在一个实际的情况下，这些非麦克斯韦电子的等离子体诊断可以得出。
The presence of an axially symmetric angular distribution of energetic electrons in hot plasmas can be detected by measuring the linear polarisation of the X-ray lines emitted from collisionally excited levels of multiply charged ions. The authors have evaluated the degree of linear polarisation of Fe24+ resonance lines and Fe23+ inner-shell excitation satellite lines observed in soft X-ray emission of solar flares and tokamaks. Collision strengths for exciting upper line magnetic sublevels were calculated using a distorted-wave method for the electron impact energy range up to 20 times the excitation threshold. It is shown how a plasma diagnostics of these non-Maxwellian electrons can be derived in a practical case.