Linear polarization of anisotropically excited x-ray lines from the n = 2 complex in He-like Ar16+

Dipti, S. W. Buechele, A. C. Gall, S. Sanders, C. I. Szabo, R. Silwal, E. Takacs, Yu Ralchenko

Research output: Article

1 Citation (Scopus)


High-resolution x-ray spectra were recorded at the National Institute of Standards and Technology electron beam ion trap (EBIT) using two Johann-type crystal spectrometers, with their dispersion planes oriented parallel and perpendicular to the beam direction. The linear polarizations of the 1s 2 - 1s2l transitions in He-like argon ions were determined from the measured spectra at electron beam energies of 3.87 and 7.91 keV. The theoretical analysis was performed using detailed collisional-radiative modeling of the non-Maxwellian EBIT plasma with the NOMAD code modified to account for magnetic sublevel atomic kinetics. Effects influencing the polarizations of the observed 1s 2- 1s2l lines were investigated, including radiative cascades, the 1s 2 1S0 - 1s2s 1S0 two-photon transition, and the charge exchange recombination of H-like argon ions. With these included, the measured polarizations of the resonance (1s 2 1S0 - 1s2p 1P1), intercombination (1s 2 1S0 - 1s2p 3P1), and forbidden lines (1s 2 1S0 - 1s2s 3S1, 1s 2 1S0 - 1s2p 3P2 ) were found to be in good agreement with the calculations.

Original languageEnglish
Article number115701
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Issue number11
Publication statusPublished - jún. 14 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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