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Conference Paper

Observation of indirect ionization of W7+ in EBIT plasma


Tu,  B.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Lu, Q., He, J., Tian, H., Li, M., Yang, Y., Yao, K., et al. (2020). Observation of indirect ionization of W7+ in EBIT plasma. Journal of Physics: Conference Series, 1412: 132004. doi:10.1088/1742-6596/1412/13/132004.

Cite as: https://hdl.handle.net/21.11116/0000-0008-19A7-0
In this work, visible and EUV spectra of W7+ have been measured using the high-temperature superconducting electron-beam ion trap at the Shanghai EBIT laboratory under extremely low-energy conditions. The relevant atomic structure has been calculated by using the flexible atomic code package and the GRASP2K code. A hypothesis for the charge-state evolution of W7+ is proposed based on our results. The occurrence of W7+ ions results from indirect ionization caused by stepwise excitation between some metastable states of lower-charge-state W ions, at the nominal electron beam energy of 59 eV.