Electron-impact excitation of tungsten ions [Formula: see text] has been studied using the fully relativistic distorted wave (RDW) theory. The excitation cross-sections of selected electric dipole allowed transitions of these ions to be determined for the incident electron energies from the excitation threshold to 20 keV. Further, the calculated cross-section results are fitted with an analytical expression for direct applications in plasma modeling. In addition, using the density matrix theory, the linear polarization of the photons emitted from the excited tungsten ions when decay to their respective ground states is presented.

中文翻译：

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W40+–W43+ 离子的电子撞击激发：横截面和极化

钨离子的电子撞击激发 [公式：见正文] 已使用完全相对论扭曲波 (RDW) 理论进行了研究。所选电偶极子的激发截面允许确定这些离子的跃迁，以确定入射电子能量从激发阈值到 20 keV。此外，计算的横截面结果与直接应用于等离子体建模的解析表达式相吻合。此外，利用密度矩阵理论，给出了从激发的钨离子发射的光子在衰变到各自基态时的线性极化。