R-matrix Electron-impact Excitation Data for the H- and He-like Ions with Z = 6−30

Plasma models built on extensive atomic data are essential to interpreting observed cosmic spectra. H-like Lyman series and He-like triplets observable in the X-ray band are powerful diagnostic lines to measure the physical properties of various types of astrophysical plasmas. Electron-impact excita...

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Bibliographic Details
Published in:The Astrophysical journal. Supplement series 2022-12, Vol.263 (2), p.35
Main Authors: Mao, Junjie, Del Zanna, G., Gu, Liyi, Zhang, C. Y., Badnell, N. R.
Format: Article
Language:English
Subjects:
Atomic physics
Atomic properties
Atomic spectroscopy
Diagnostic systems
Electron impact excitation
Electrons
Excitation
Helium
Ions
Physical properties
Quality assessment
Radiation
Spectrometers
X ray spectrometers
X-ray astronomy
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Summary:Plasma models built on extensive atomic data are essential to interpreting observed cosmic spectra. H-like Lyman series and He-like triplets observable in the X-ray band are powerful diagnostic lines to measure the physical properties of various types of astrophysical plasmas. Electron-impact excitation is a fundamental atomic process for the formation of H-like and He-like key diagnostic lines. Electron-impact excitation data adopted by the widely used plasma codes (AtomDB, CHIANTI, and SPEX) do not necessarily agree with each other. Here we present a systematic calculation of electron-impact excitation data of H-like and He-like ions with the atomic number Z = 6–30 (i.e., C to Zn). A radiation-damped R -matrix intermediate-coupling frame transformation calculation was performed for each ion with configurations up to n = 6. We compare the present work with the above three plasma codes and the literature to assess the quality of the new data, which are relevant for current and future high-resolution X-ray spectrometers.
ISSN:0067-0049
1538-4365
DOI:10.3847/1538-4365/ac9c57