A xenon collisional-radiative model applicable to electric propulsion devices: I. Calculations of electron-impact cross sections for xenon ions by the Dirac B-spline R-matrix method

A fully relativistic Dirac B-spline R-matrix (DBSR) method is applied to calculate the oscillator strengths and electron-impact excitation cross sections involving the 5s25p5, 5s5p6, 5p46s, 5p45d, 5p46p, and 5p47s states of a Xe+ ion. A fully relativistic approach is necessary for this problem, sinc...

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Bibliographic Details
Published in:Plasma sources science & technology 2019-10, Vol.28 (10), p.105004
Main Authors: Wang, Yang, Wang, Yan-Fei, Zhu, Xi-Ming, Zatsarinny, Oleg, Bartschat, Klaus
Format: Article
Language:English
Subjects:
close-coupling
collisional-radiative model
cross sections
Dirac B-spline R-matrix method
electron impact
xenon ion
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Summary:A fully relativistic Dirac B-spline R-matrix (DBSR) method is applied to calculate the oscillator strengths and electron-impact excitation cross sections involving the 5s25p5, 5s5p6, 5p46s, 5p45d, 5p46p, and 5p47s states of a Xe+ ion. A fully relativistic approach is necessary for this problem, since the spin-orbit coupling is of the same order as electron correlations in the outer shells of Xe+. Also, there is a complex open-shell structure with strong term dependence in the one-electron orbitals. The oscillator strengths are also calculated and agree well with available experimental measurements. We select some important excitation cross sections out of the ground, metastable, and quasi-metastable states of Xe+ for the collisional-radiative (CR) model to be discussed and analyzed. The present paper is the first one of a series of studies on a CR model of xenon ions in plasma diagnosis and numerical simulations of Hall and ion thrusters. In subsequent papers, the cross-section data for the Xe+ ion, together with those for neutral Xe from our previous calculation, are used to build a comprehensive CR model for electric propulsion systems involving xenon. Furthermore, the predictions of this model will then be examined by experiments in both Hall and ion thrusters.
ISSN:0963-0252
1361-6595
1361-6595
DOI:10.1088/1361-6595/ab3125