Direct Observation of the M1 Transition between the Ground Term Fine Structure Levels of W VIII
Direct Observation of the M1 Transition between the Ground Term Fine Structure Levels of W VIII
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DOI：
10.3390/atoms5010013
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发表时间：
2017-03
期刊：
影响因子：
1.8
通讯作者：
M. Mita;H. Sakaue;D. Kato;I. Murakami;N. Nakamura
中科院分区：
文献类型：
--
作者：
M. Mita;H. Sakaue;D. Kato;I. Murakami;N. Nakamura
我们直接观察到 W VIII 的 4 f 13 5 s 2 5 p 6 2 F 基项中精细结构分裂之间的 M1 转变。几次电离钨离子的光谱数据对于未来的ITER诊断很重要，但数据严重缺乏。本研究是解决这一问题的持续努力的一部分。使用车尔尼-特纳可见光谱仪观察紧凑型电子束离子阱中产生并捕获的钨离子的发射。同时还观察 EUV 范围内的光谱，以帮助识别以前未报告的可见线。观测到的波长 574.47 ± 0.03 nm（空气），对应于 17,402.5 ± 0.9 cm - 1 的精细结构分裂，与先前报道的通过 EUV 光谱分析间接获得的值 17,410 ± 5 cm - 1 相当一致 [Ryabtsev et al., Atoms 3 (2015) 273]。
We present a direct observation of the M1 transition between the fine structure splitting in the 4 f 13 5 s 2 5 p 6 2 F ground term of W VIII. The spectroscopic data of few-times ionized tungsten ions are important for the future ITER diagnostics, but there is a serious lack of data. The present study is part of an ongoing effort to solve this problem. Emission from the tungsten ions produced and trapped in a compact electron beam ion trap is observed with a Czerny–Turner visible spectrometer. Spectra in the EUV range are also observed at the same time to help identify the previously-unreported visible lines. The observed wavelength 574.47 ± 0.03 nm (air), which corresponds to the fine structure splitting of 17,402.5 ± 0.9 cm − 1 , shows reasonable agreement with the previously reported value 17,410 ± 5 cm − 1 obtained indirectly through the analysis of EUV spectra [Ryabtsev et al., Atoms 3 (2015) 273].