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EUV measurements of Kr XXI--Kr XXXIV and the effect of a magnetic-dipole line on allowed transitions

Published

Author(s)

Yuri A. Podpaly, John D. Gillaspy, Yuri Ralchenko, Joseph Reader

Abstract

We observed and analyzed the extreme-ultraviolet spectra of highly-charged ions of Kr XXI to Kr XXXIV produced in an Electron Beam Ion Trap (EBIT). The beam energies varied between 1.1 keV and 30 keV, and the wavelengths were observed between 3 nm and 17.3 nm with uncertainties of about 0.002 nm to 0.003 nm. Six previously unknown lines were identified, and wavelength uncertainties have been improved for eighteen additional transitions. It was found that a line intensity ratio for allowed transitions 3s^2 3p—3s^2 3d in Al-like Kr XXIV strongly deviated from predictions based on statistical weighting of the excited levels. Collisional-radiative modeling showed that this effect, which is due to the magnetic-dipole transition within the ground configuration 3s^2 3p, offers sensitive diagnostics of electron density in the regime of interest to fusion tokamaks, EBITs, and other low-density plasmas.
Citation
Journal of Physics B-Atomic Molecular and Optical Physics
Volume
47
Issue
095702

Keywords

Extreme ultraviolet, Spectroscopy, krypton, Atomic physics

Citation

Podpaly, Y. , Gillaspy, J. , Ralchenko, Y. and Reader, J. (2014), EUV measurements of Kr XXI--Kr XXXIV and the effect of a magnetic-dipole line on allowed transitions, Journal of Physics B-Atomic Molecular and Optical Physics, [online], https://doi.org/10.1088/0953-4075/47/9/095702 (Accessed April 14, 2024)
Created April 24, 2014, Updated October 9, 2019