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Title: EUV Spectra and Line Ratios of Multiply Ionized Calcium and Argon Atoms in a Laboratory Plasma

Journal Article · · The Astrophysical Journal (Online)
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [5]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Ruhr-Univ. Bochum, Bochum (Germany). Astronomisches Inst.
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of California, Berkeley, CA (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
+ Show Author Affiliations

The utility of Ca in the EUV spectral range of astrophysical observations is limited by a fragmentary and incomplete record of laboratory data. In order to obtain a more comprehensive survey of the Ca line emission in the EUV, we have used a tokamak plasma discharge in hydrogen carrying some Ar and intermittently seeded with Ca as a tool for investigating the emission line intensity pattern of highly charged Ca and Ar ions in the wavelength range 100–285 Å with 0.35 Å spectral resolution. Here, we compare our data to wavelengths and line ratios in much-used databases, especially CHIANTI, and we discuss apparent inconsistencies.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1545272
Report Number(s):
LLNL-JRNL--753784
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 865; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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The Allure of High Total Angular Momentum Levels in Multiply-Excited Ions journal November 2019

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