Circular polarization of the Fe XXV x-ray lines following collisional excitation by longitudinally polarized electrons.
Circular polarization of the Fe XXV x-ray lines following collisional excitation by longitudinally polarized electrons.
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DOI：
10.1103/physreva.46.2449
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发表时间：
1992-09
期刊：
影响因子：
--
通讯作者：
M. Inal;Hong Lin Zhang;DH Sampson
中科院分区：
文献类型：
--
作者：
M. Inal;Hong Lin Zhang;DH Sampson
理论上研究了由纵向偏振电子束碰撞激发的类氦铁发射的 X 射线的圆偏振。通过两种不同的畸变波方法计算了从 1{ital s}{sup 2} 地平面激发不同的 {ital n}=2 和 3 个磁亚层所需的碰撞强度，并进行了相互比较。协议总体上是好的。其中一种方法是半相对论性的，另一种方法是完全相对论性的，其中 QED 效应包含在计算的原子结构部分中。磁偶极子 1 {sup 1}{ital S}{sub 0--}2 {sup 3}{ital S}{sub 1} 和四极子 1 {sup 1}{ital S}{sub 0--}2 {sup 3}{ital P}{sub 2} 线获得高度圆极化，而组合线 1 {sup 1}{ital S}{sub 0--}2 {sup 3}{ital P}{sub 1}被发现在近阈值区域几乎完全圆偏振。除了对原子碰撞物理学具有内在兴趣外，所报告的结果可能在未来的高温等离子体诊断中具有有用的应用，以期提供有关超热电子束可能极化的信息。
The circular polarization of x-ray lines emitted by heliumlike iron collisionally excited by a longitudinally polarized electron beam has been investigated theoretically. The required collision strengths for excitation of the different {ital n}=2 and 3 magnetic sublevels from the 1{ital s}{sup 2} ground level have been calculated by two different distorted-wave methods and compared with each other. The agreement is generally good. One of these methods is semirelativistic, and the other is fully relativistic with QED effects included in the atomic structure part of the calculations. A high degree of circular polarization is obtained for the magnetic dipole 1 {sup 1}{ital S}{sub 0--}2 {sup 3}{ital S}{sub 1} and quadrupole 1 {sup 1}{ital S}{sub 0--}2 {sup 3}{ital P}{sub 2} lines, while the intercombination line 1 {sup 1}{ital S}{sub 0--}2 {sup 3}{ital P}{sub 1} is found to be almost completely circularly polarized in the near-threshold region. In addition to being of intrinsic interest for atomic collision physics, the reported results might have useful applications in future diagnostics of high-temperature plasmas with a view to providing information on the possible polarization of suprathermal electron beams.