Relativistic effects on the cross section and circular polarization of x-ray radiation following longitudinally-polarized electron impact excitation of highly charged ions

Relativistic effects on the cross section and circular polarization of x-ray radiation following longitudinally-polarized electron impact excitation of highly charged ions
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高电荷离子纵向极化电子碰撞激发后 X 射线辐射横截面和圆极化的相对论效应

DOI:
10.1088/0953-4075/48/4/045202
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发表时间:
2015-02
影响因子:
1.6
通讯作者:
Dong, C. Z.
Dong, C. Z.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Chen, Z. B.;Zeng, J. L.;Dong, C. Z.

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用完全相对论扭曲波方法详细计算了纵向极化电子从基态到1 s2 p 3 / 2?>(J = 2)?>高电荷态的类氦离子。详细研究了相对论效应对x射线光电子发射截面和圆偏振的影响。对于激发过程,结果表明,相对论效应可能会变得重要,导致相当大的增强截面。相对论效应的加入可以使截面改变几个数量级,特别是对Mf =-1?> #21040;,2?磁子级对于退激过程,相对论效应使圆极化度减小,当入射电子能量和原子序数增大时,这些特征更加明显。相对论效应被发现是更大的辐射线偏振的情况下相比。
Detailed calculations using a fully relativistic distorted-wave method are carried out for the cross sections of longitudinally polarized electron impact excitation from the ground state to the magnetic sublevels of the 1s2p 3 / 2 ?> ( J = 2 ) ?> state of highly charged He-like ions. The relativistic effects on the cross sections and circular polarization of the x-ray photoemission are investigated in detail. For the excitation process, results show that the relativistic effects may become important leading to considerable enhancements in the cross sections. The inclusion of the relativistic effects can modify the cross sections by several orders of magnitude, especially to the Mf = − 1 ?> and − 2 ?> magnetic sublevels. For the de-excitation process, the relativistic effects make the degree of circular polarization decreases, these features are more pronounced when the incident electron energy and/or atomic number increase. The relativistic effects are found to be much larger compared to the case of the linear polarization of radiation.
DOI: 10.1103/physrevlett.65.705
发表时间: 1990-08
影响因子: 8.6
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