Analysis of EUV spectra from N-shell tungsten ions observed with an electron beam ion trap
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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.
- 2.E. Lassner, W.-D. Schubert, The element tungsten (Springer, Berlin, 1999) Google Scholar
- 18.A. Kramida, Yu. Ralchenko, J. Reader, NIST ASD Team, NIST atomic spectra database (version 5.5.1) (National Institute of Standards and Technology, Gaithersburg, MD, 20l7), Available at: https://physics.nist.gov/asd
- 25.I. Hughes, T. Hase, Measurements and their uncertainties (Oxford University Press, Oxford, New York, 2012) Google Scholar
- 33.R. Karpuškienė, P. Bogdanovich, R. Kiselius, At. Data Nucl. Data Tables 115–116, 385 (2017) Google Scholar