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Journal Article

Uncertainties in Atomic Data for Modeling Astrophysical Charge Exchange Plasmas


Shah,  Chintan
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Gu, L., Shah, C., & Zhang, R. (2022). Uncertainties in Atomic Data for Modeling Astrophysical Charge Exchange Plasmas. Sensors, 22(3): 752. doi:10.3390/s22030752.

Cite as: https://hdl.handle.net/21.11116/0000-000A-DC03-B
Relevant uncertainties of theoretical atomic data are vital to determining the accuracy of plasma diagnostics in a number of areas, including, in particular, the astrophysical study. We present a new calculation of the uncertainties on the present theoretical ion-impact charge exchange atomic data and X-ray spectra, based on a set of comparisons with the existing laboratory data obtained in historical merged-beam, cold-target recoil-ion momentum spectroscopy, and electron beam ion traps experiments. The average systematic uncertainties are found to be 35-88% on the total cross sections, and 57-75% on the characteristic line ratios. The model deviation increases as the collision energy decreases. The errors on total cross sections further induce a significant uncertainty to the calculation of ionization balance for low-temperature collisional plasmas. Substantial improvements of the atomic database and dedicated laboratory measurements are needed to obtain the current models, ready for the X-ray spectra from the next X-ray spectroscopic mission.