Angular Distribution and Polarization of the 3C and 3D Lines Following Electron-impact Excitation of Fe16+ Ions
Angular Distribution and Polarization of the 3C and 3D Lines Following Electron-impact Excitation of Fe16+ Ions
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DOI：
10.3847/1538-4357/abe7f2
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
Z. Wu;Z. Tian;Y. An;C. Dong
中科院分区：
文献类型：
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作者：
Z. Wu;Z. Tian;Y. An;C. Dong
在多组态Dirac-Fock方法和相对论扭曲波理论的框架下，研究了类铁离子Fe ~（16+）从基态到激发态的电子碰撞激发以及随后的辐射衰变.特别注意了Fe ~（16+）离子辐射衰变中与天体物理相关的3C共振线和互组合3D谱线的发射行为。为此，我们计算了一系列碰撞电子能量的两条谱线的角分布和线极化。结果表明，共振3C线的角特性和偏振特性与互组合3D线的角特性和偏振特性基本相同。然而，这两条谱线的角度和极化行为被发现是非常敏感的碰撞电子能量，特别是在低碰撞能量。基于这样的灵敏度，预计3C和3D线的高精度角度和偏振测量可以作为揭示相关实验室和天体物理等离子体的电子能量等详细信息的工具。
The electron-impact excitations from the ground state to the excited levels and as well as the subsequent radiative decays of neonlike Fe16+ ions have been investigated within the framework of the multiconfigurational Dirac–Fock method and the relativistic distorted-wave theory. Special attention has been paid to emission behaviors of the astrophysically relevant resonance 3C and intercombination 3D lines emitted in the radiative decays of Fe16+ ions. To this end, we calculate the angular distribution and linear polarization of both of the lines for a series of impact electron energies. It is found that the angular and polarization behaviors of the resonance 3C line are nearly the same as those of the intercombination 3D line. Nevertheless, the angular and polarization behaviors of both of the lines are found to be very sensitive to the impact electron energy, especially at low impact energies. Based on such a sensitivity, it is expected that high-precision angular and polarization measurements of the 3C and 3D lines could be served as a tool for revealing detailed information such as electron energy of relevant laboratory and astrophysical plasmas.