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Abstract
In this work, visible and EUV spectra of W7+ have been measured using the high-temperature super-conducting 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.
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Details
1 Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai 200433, China; Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Fudan University, Shanghai 200433, China
2 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
3 Max-Planck-Institute für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany