Theory of X-Ray Anisotropy and Polarization Following the Dielectronic Recombination of Initially Hydrogen-Like Ions
Theory of X-Ray Anisotropy and Polarization Following the Dielectronic Recombination of Initially Hydrogen-Like Ions
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DOI：
10.1088/0256-307x/30/2/023402
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发表时间：
2013-02
影响因子：
3.5
通讯作者：
Y. Shi 师;C. Dong 董;F. Stephan;D. Zhang 张;L. Xie 颉
中科院分区：
文献类型：
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作者：
Y. Shi 师;C. Dong 董;F. Stephan;D. Zhang 张;L. Xie 颉
在初始类氢离子的 K-LL 双电子复合之后，研究了高电荷类氦离子的 X 射线光电发射的角分布和偏振。计算是在密度矩阵理论结合多配置Dirac-Fock方法的框架内进行的。人们关注共振中间态的磁亚能级排列及其不均匀的辐射衰减过程。结果表明，与仅结合（非相对论性）库仑相互作用相比，入射电子和目标电子之间的 Breit 相互作用对于谐振态的排列起着重要作用，从而导致 X 射线发射特性发生重大变化。对准参数中最显着的差异是在 2s2p1/2 J = 1 共振态中发现的，原子序数范围很广，从 9 到 92。对于类氦离子的这种共振态，Breit 相互作用对于核电荷 Z ∼ 30 的离子已经变得很重要。
The angular distribution and polarization of the x-ray photoemission of highly charged helium-like ions is studied following the K—LL dielectronic recombination of initially hydrogen-like ions. Calculation is carried out within the framework of the density matrix theory combined with the multiconfiguration Dirac—Fock approach. Attention is paid to magnetic sublevel alignment in the resonant intermediate state and to its nonuniform radiative decay processes. It is shown that the Breit interaction between the incident and target electrons plays a significant role for the alignment of the resonant state and thus causes a substantial change in the x-ray emission characteristic, when compared to the incorporation of only the (non-relativistic) Coulomb interaction. The most prominent difference in alignment parameter is found in the 2s2p1/2 J = 1 resonant state for a wide range of atomic numbers from 9 to 92. For this resonant state of helium-like ions, the Breit interaction becomes significant for ions with nuclear charge Z ∼ 30 already.