R -matrix electron-impact excitation data for the H- and He-like ions with Z = 6−30

Mao, Junjie and Del Zanna, G. and Gu, Liyi and Zhang, C. Y. and Badnell, N. R. (2022) R -matrix electron-impact excitation data for the H- and He-like ions with Z = 6−30. Astrophysical Journal Supplement, 263 (2). 35. ISSN 0067-0049 (https://doi.org/10.3847/1538-4365/ac9c57)

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Abstract

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.

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