Observation of indirect ionization of W7+ in an electron-beam ion-trap plasma

Lu, Q.; He, J.; Tian, H.; Li, M.; Yang, Y.; Yao, K.; Chen, C.; Xiao, J.; Li, J. G.; Tu, B.; Tu, B.; Zou, Y.

doi:10.1103/PhysRevA.99.042510

アイテム詳細

登録内容を編集ファイル形式で保存

一時保存へ追加

タグ情報を表示リリース履歴を表示詳細要約

公開

学術論文

Observation of indirect ionization of W⁷⁺ in an electron-beam ion-trap plasma

MPS-Authors

/persons/resource/persons213212

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

External Resource

There are no locators available

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

フルテキスト (公開)

公開されているフルテキストはありません

付随資料 (公開)

There is no public supplementary material available

引用

Lu, Q., He, J., Tian, H., Li, M., Yang, Y., Yao, K., Chen, C., Xiao, J., Li, J. G., Tu, B., Tu, B., & Zou, Y. (2019). Observation of indirect ionization of W⁷⁺ in an electron-beam ion-trap plasma. Physical Review A, 99(4):. doi:10.1103/PhysRevA.99.042510.

引用: https://hdl.handle.net/21.11116/0000-0005-4C83-2

要旨

In this work, visible and extreme ultraviolet spectra of W7+ are measured using the high-temperature superconducting electron-beam ion trap (EBIT) at the Shanghai EBIT Laboratory under extremely low-energy conditions (lower than the nominal electron-beam energy of 130 eV). The relevant atomic structure is calculated using the flexible atomic code package based on the relativistic configuration interaction method. The GRASP2K code, in the framework of the multiconfiguration Dirac-Hartree-Fock method, is employed as well for calculating the wavelength of the M1 transition in the ground configuration of W7+. A line from the W7+ ions is observed at a little higher electron-beam energy than the ionization potential for W4+, making this line appear to be from W5+. A hypothesis for the charge-state evolution of W7+ is proposed based on our experimental and theoretical results; that is, 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.