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Open AccessFeature PaperArticle

Direct Observation of the M1 Transition between the Ground Term Fine Structure Levels of W VIII

Institute for Laser Science, The University of Electro-Communications, Tokyo 182-8585, Japan
National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Gifu 509-5292, Japan
Department of Fusion Science, SOKENDAI (The Graduate University for Advanced Studies), Toki, Gifu 509-5292, Japan
Author to whom correspondence should be addressed.
Academic Editor: Elmar Träbert
Atoms 2017, 5(1), 13;
Received: 1 November 2016 / Revised: 4 February 2017 / Accepted: 28 February 2017 / Published: 8 March 2017
(This article belongs to the Special Issue Perspectives of Atomic Physics with Trapped Highly Charged Ions)
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]. View Full-Text
Keywords: EBIT; tungsten ions; visible spectroscopy; plasma diagnostics EBIT; tungsten ions; visible spectroscopy; plasma diagnostics
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Mita, M.; Sakaue, H.A.; Kato, D.; Murakami, I.; Nakamura, N. Direct Observation of the M1 Transition between the Ground Term Fine Structure Levels of W VIII. Atoms 2017, 5, 13.

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