Polarization of the nf 鈫?3d (n=4, 5, 6) x-rays from tungsten ions following electron-impact excitation and dielectronic recombination processes

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• 作者：L.Y. Xie^a ; ^b ; X.Y. Ma^a ; ^b ; C.Z. Dong^a ; ^b ; ^{dongcz@nwnu.edu.cn" class="auth_mail} ; Z.W. Wu^a ; ^b ; Y.L. Shi^a ; ^b ; J. Jiang^a ; ^b
• 关键词：Tungsten ions ; Relativistic distorted-wave method ; Electron-impact excitation ; Dielectronic recombination ; X-rays ; Linear polarization
• 刊名：Journal of Quantitative Spectroscopy and Radiative Transfer
• 出版年：July, 2014
• 年：2014
• 卷：141
• 期：Complete
• 页码：31-39
• 全文大小：825 K

文摘

Electron-impact excitation and resonant electron capture cross sections to the specific magnetic sublevels as well as the polarization of the strong (n=4, 5, 6) x-ray emitted from Ni-like through Ge-like tungsten ions have been studied systematically by using a fully relativistic distorted-wave method. We compare the polarizations for the same x-ray but from the above two different processes for the first time. It is found that the polarization degrees of x-ray following both the electron-impact excitation and the dielectronic recombination are totally different. Because the electron-impact excitation dominates in hot and dense plasmas and the dielectronic recombination plays a key role in low-density plasmas which are cooled and recombining by capturing continuum electrons, we hope that the specific plasmas conditions could be assessed by using these x-ray polarizations.