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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)


atomic spectra, collisional-radiative modeling, high multipoles, highly-charged ions, radiative transitions, tungsten


Ralchenko, Y. , Tan, J. , Gillaspy, J. , Pomeroy, J. and Silver, E. (2006), Accurate Modeling of Benchmark X-ray Spectra from Highly-Charged Ions of Tungsten, Physical Review A (Atomic, Molecular and Optical Physics) (Accessed April 14, 2024)
Created October 25, 2006, Updated October 12, 2021