High-resolution Laboratory Measurements of K-shell X-Ray Line Polarization and Excitation Cross Sections in Helium-like S XV Ions

@article{Shah2021HighresolutionLM,
  title={High-resolution Laboratory Measurements of K-shell X-Ray Line Polarization and Excitation Cross Sections in Helium-like S XV Ions},
  author={Chintan Shah and Natalie Hell and Antonia Hubbard and Ming Feng Gu and Michael J. MacDonald and Megan E. Eckart and Richard Lloyd Kelley and Caroline A. Kilbourne and Maurice A. Leutenegger and Frederick S. Porter and Gregory V. Brown},
  journal={The Astrophysical Journal},
  year={2021},
  volume={914}
}
We report measurements of electron-impact excitation cross sections for the strong K-shell n = 2 → 1 transitions in S xv, using the LLNL EBIT-I electron beam ion trap, two crystal spectrometers, and the EBIT Calorimeter Spectrometer. The cross sections are determined by direct normalization to the well-known cross sections of radiative electron capture, measured simultaneously. Using contemporaneous polarization measurements with the two crystal spectrometers, whose dispersion planes are… 
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