Investigation of transitions between metastable levels of the first excited configuration of palladium-like tungsten
Investigation of transitions between metastable levels of the first excited configuration of palladium-like tungsten
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DOI：
10.1088/0953-4075/47/17/175002
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发表时间：
2014-08
期刊：
影响因子：
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通讯作者：
M. L. Qiu;R. Zhao;X. Guo;Z. Z. Zhao-Z.;W. Li;S. Du;J. Xiao;K. Yao;C. Chen;R. Hutton
中科院分区：
文献类型：
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作者：
M. L. Qiu;R. Zhao;X. Guo;Z. Z. Zhao-Z.;W. Li;S. Du;J. Xiao;K. Yao;C. Chen;R. Hutton
用复旦大学的高温超导电子束离子陷阱装置(SH-HtscEBIT)对高电荷态钨进行了330~400 nm波段的光谱测量。类钯钨(W28+)的三条谱线被鉴定为第一激发态([Kr]4d94f)亚稳态能级之间的跃迁。采用二阶相对论多体微扰理论方法和简单的碰撞辐射模型，对4d94f组态的精细结构能级进行了理论研究。计算结果与实验结果定性吻合。我们的结论是，4d94f激发组态中的某些能级具有极长的寿命，并且可能表现出极高的布居，例如，可能导致聚变等离子体中的间接电离。
Spectroscopy in the wavelength region of 330 nm to 400 nm for highly charged tungsten was performed using the High Temperature Super Conducting Electron Beam Ion Trap (SH-HtscEBIT) at Fudan University. Three lines from palladium-like tungsten (W28+) were identified as transitions between metastable levels in the first excited configuration ([Kr]4d94f). A second-order relativistic many-body perturbation theory approach and a simple collisional radiative model were used to theoretically study the fine structure levels of the 4d94f configuration. The calculated results show qualitative agreement with experiment. We conclude that some levels in the 4d94f excited configuration have extremely long lifetimes and may exhibit extraordinarily high populations, possibly leading to indirect ionization in, for example, fusion plasmas.