New measurement resolves key astrophysical Fe XVII oscillator strength problem

S Kühn, C Cheung, NS Oreshkina, R Steinbrügge… - Physical review …, 2022 - APS
One of the most enduring and intensively studied problems of x-ray astronomy is the
disagreement of state-of-the art theory and observations for the intensity ratio of two Fe XVII …

High resolution photoexcitation measurements exacerbate the long-standing Fe XVII oscillator strength problem

S Kühn, C Shah, JRC López-Urrutia, K Fujii… - Physical review …, 2020 - APS
For more than 40 years, most astrophysical observations and laboratory studies of two key
soft x-ray diagnostic 2 p-3 d transitions, 3 C and 3 D, in Fe XVII ions found oscillator strength …

X-ray spectra of the Fe-L complex-III. Systematic uncertainties in atomic data

L Gu, C Shah, J Mao, AJJ Raassen, J de Plaa… - Astronomy & …, 2022 - aanda.org
There has been a growing request from the X-ray astronomy community for a quantitative
estimate of systematic uncertainties originating from the atomic data used in plasma codes …

X-ray spectra of the Fe-L complex-II. Atomic data constraints from the EBIT experiment and X-ray grating observations of Capella

L Gu, C Shah, J Mao, T Raassen, J De Plaa… - Astronomy & …, 2020 - aanda.org
The Hitomi results for the Perseus cluster have shown that accurate atomic models are
essential to the success of X-ray spectroscopic missions and just as important as the store of …

High-resolution laboratory measurements of K-shell X-ray line polarization and excitation cross sections in helium-like S XV ions

C Shah, N Hell, A Hubbard, MF Gu… - The Astrophysical …, 2021 - iopscience.iop.org
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 …

Calculations of electron-impact excitation and dielectronic recombination rate coefficients of highly charged silicon ions

LY Xie, JL Rui, JM Zhang, R Schuch, CZ Dong - Physical Review A, 2022 - APS
The rate coefficients for dielectronic recombination and electron-impact excitation processes
with H-like to Be-like silicon ions (Si 13+-Si 10+) are calculated using relativistic distorted …

Apparent change of the 3C/3D line intensity ratio in neonlike ions

Z Yang, Z He, G Xiong, K Yao, Y Yang, B Wei, Y Zou… - Optics …, 2022 - opg.optica.org
The resonance 3C ([(2p^ 5) _1/23d_3/2] _J= 1→[2p^ 6] _J= 0) to intercombination 3D ([(2p^
5) _3/23d_5/2] _J= 1→[2p^ 6] _J= 0) line intensity ratio of neonlike ions has been studied …

Theoretical study of dielectronic recombination and electron-impact excitation for helium-like isoelectronic sequence

JL Rui, LY Xie, YL Ma, CZ Dong - The European Physical Journal D, 2023 - Springer
The cross sections and rate coefficients for dielectronic recombination (DR) and electron-
impact excitation processes of helium-like isoelectronic sequence are systematically …

Comprehensive laboratory measurements resolving the lmm dielectronic recombination satellite lines in ne-like fe XVII ions

F Grilo, C Shah, S Kühn, R Steinbrügge… - The Astrophysical …, 2021 - iopscience.iop.org
Comprehensive Laboratory Measurements Resolving the LMM Dielectronic Recombination
Satellite Lines in Ne-like Fe xvii Ions - IOPscience This site uses cookies. By continuing to use …

Natural-linewidth measurements of the and soft-x-ray transitions in Ni xix

C Shah, S Kühn, S Bernitt, R Steinbrügge, M Togawa… - Physical Review A, 2024 - APS
We used the monochromatic soft-x-ray beamline P04 at the synchrotron-radiation facility
PETRA III to resonantly excite the strongest 2 p-3 d transitions in neonlike Ni xix ions,[2 p 6] …