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

• MITA, Momoe

• SAKAUE, Hiroyuki A.

• KATO, Daiji

• MURAKAMI, Izumi

• Nakamura, Nobuyuki

抄録

We present a direct observation of the M1 transition between the fine structure splitting in the 4f135s25p6 2F 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].

収録刊行物

• Atoms

  Atoms 5 (1), 13-, 2017-03-08

  MDPI

キーワード

• EBIT
• tungsten ions
• visible spectroscopy
• plasma diagnostics

詳細情報

• CRID: 1050009683109334016
• NII論文ID: 120007191866
• ISSN: 22182004
• DOI: 10.3390/atoms5010013
• HANDLE: 10655/00013047
• Web Site: https://nifs-repository.repo.nii.ac.jp/records/11096
• Web Site: http://www.mdpi.com/2218-2004/5/1/13/pdf
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
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