Visible spectra of W8+ in an electron-beam ion trap

C. L. Yan; C. Y. Chen; G. Q. Xu; J. G. Li; J. G. Wang; J. Meng; J. Xiao; Q. Lu; Y. Yang; Y. Zou

Visible spectra of W8+ in an electron-beam ion trap

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arxiv 2101.11193 v1 pith:RDWCR33V submitted 2021-01-27 physics.atom-ph

Q. Lu , C. L. Yan , J. Meng , G. Q. Xu , Y. Yang , C. Y. Chen , J. Xiao , J. G. Li

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J. G. Wang Y. Zou

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classification physics.atom-ph

keywords electron-beamspectraatomiccodeconfigurationslinestrapvisible

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To provide spectroscopic data for lowly charged tungsten ions relevant to fusion research, this work focuses on the W8+ ion. Six visible spectra lines in the range of 420-660 nm are observed with a compact electron-beam ion trap in Shanghai. These lines are assigned to W8+ based on their intensity variations as increasing electron-beam energy and the M1 line from the ground configuration in W7+. Furthermore, transition energies are calculated for the 30 lowest levels of the 4f14 5s2 5p4, 4f13 5s2 5p5 and 4f12 5s2 5p6 configurations of W8+ by using the flexible atomic code (FAC) and GRASP package, respectively. Reasonably good agreement is found between our two independent atomic-structure calculations. The resulting atomic parameters are adopted to simulate the spectra based on the collisional-radiative model implemented in the FAC code. This assists us with identification of six strong M1 transitions in 4f13 5s2 5p5 and 4f12 5s2 5p6 configurations from our experiments

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