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Analysis of EUV spectra from N-shell tungsten ions observed with an electron beam ion trap

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Abstract

Extreme ultraviolet spectra of highly charged tungsten ions were produced with an electron beam ion trap at the National Institute of Standards and Technology and recorded with a flat-field grazing-incidence spectrometer. The spectra were measured in the wavelength range 2.7–17.3 nm while the beam energy varied between 1.65 and 2.00 keV. At these energies, the ionization stages from Zr-like W34+ to Se-like W40+ ions were observed. Large-scale collisional-radiative modelling was used to identify the strong lines, including 15 new ones, which represent electric dipole n = 4–4 transitions in these ions. While a good quantitative agreement between theoretical and experimental data was found for almost all ions, some of the tentatively identified wavelengths in W35+ significantly disagree from all available calculations.

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Authors and Affiliations

  1. National Institute of Standards and Technology, Gaithersburg, MD, 20899-8422, USA

    Tapasi Das, Yuri A. Podpaly, Joseph Reader, John D. Gillaspy & Yuri Ralchenko

Authors
  1. Tapasi Das
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  2. Yuri A. Podpaly
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  3. Joseph Reader
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  4. John D. Gillaspy
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  5. Yuri Ralchenko
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Correspondence to Yuri Ralchenko.

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Das, T., Podpaly, Y.A., Reader, J. et al. Analysis of EUV spectra from N-shell tungsten ions observed with an electron beam ion trap. Eur. Phys. J. D 72, 124 (2018). https://doi.org/10.1140/epjd/e2018-90118-7

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  • DOI: https://doi.org/10.1140/epjd/e2018-90118-7

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