Z-dependent crossing of excited-state energy levels in highly charged galliumlike lanthanide atomic ions
Z-dependent crossing of excited-state energy levels in highly charged galliumlike lanthanide atomic ions
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高电荷类镓镧系原子离子中激发态能级的 Z 相关交叉
DOI：
10.1103/physreva.105.032802
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发表时间：
2022
影响因子：
2.9
通讯作者：
Nakamura Nobuyuki
中科院分区：
文献类型：
--
作者：
Koike Fumihiro;Suzuki Chihiro;Murakami Izumi;Kato Daiji;Tamura Naoki;Nakamura Nobuyuki
研究了镧系高电荷态离子的极紫外光跃迁。用光谱法测量了类镓镧系元素在大螺旋装置（LHD）等离子体和电子束离子阱（EBIT）等离子体中的跃迁谱线。Eu离子的波长在LHD和EBIT测量之间是一致的。由于自旋轨道相互作用沿着增强，从镧到镥，轨道间的能级分裂显著增大，导致波长相关曲线的交叉。用多组态Dirac-Fock方法计算了谱线的位置和强度。混合的和配置导致避免交叉的表观波长曲线.组态混合使得能级交叉点附近的极紫外光谱中的线和线都很清晰.水平被发现之间的交叉和63。
Extreme ultraviolet (EUV) optical transitions of lanthanide highly charged ions have been studied. Theandtransition lines of galliumlike lanthanide elements have been spectroscopically measured in large helical device (LHD) plasma and electron-beam ion trap (EBIT) plasma. The wavelengths for Eu ions agreed withinbetween the LHD and EBIT measurements. Due to the enhancement of spin-orbit interactions along with the increase of atomic numberinatomic orbitals, energy splitting betweenandorbitals increases significantly from lanthanum to lutetium, causing the crossing of-dependent wavelength curves. The spectral line positions and strengths are theoretically calculated by means of the multiconfiguration Dirac-Fock method. The mixing of theandconfigurations leads to an avoided crossing in the apparent wavelength curves. The configuration mixing makes both theandlines well visible in the EUV spectra near the level crossing point. The levels are found to cross betweenand 63.