Accurate Modeling of Benchmark X-ray Spectra from Highly-Charged Ions of Tungsten
Y Ralchenko, Joseph N. Tan, John D. Gillaspy, Joshua M. Pomeroy, E Silver
We present detailed collisional-radiative modeling for the benchmark x-ray spectrum of highly-charged tungsten ions in the range between 3 \AA \ and 10 \AA produced in an Electron Beam Ion Trap (EBIT) with a beam energy of 4.08 keV. Remarkably good agreement between calculated and measured spectra was obtained without adjustable parameters, highlighting the well-controlled experimental conditions and the sophistication of the kinetic simulation of the non-Maxwellian tungsten plasma. The convergence between theory and measurement was instrumental in the identification of new spectral lines from Cu-like W$^45+}$ and Ni-like W$^46+}$ ions, led to the re-interpretation of a previously misidentified line in Ni-like ion as an overlap of electric-quadrupole and magnetic-octupole lines, and revealed subtle features in the x-ray spectrum arising from the dominance of forbidden transitions between excited states. The importance of level population channels specific to the EBIT plasma is discussed as well.
Physical Review A (Atomic, Molecular and Optical Physics)
, Tan, J.
, Gillaspy, J.
, Pomeroy, J.
and Silver, E.
Accurate Modeling of Benchmark X-ray Spectra from Highly-Charged Ions of Tungsten, Physical Review A (Atomic, Molecular and Optical Physics)
(Accessed June 3, 2023)