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

Junjie Mao, G. Del Zanna, Liyi Gu, C. Y. Zhang, N. R. Badnell

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
27 Downloads (Pure)


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.
Original languageEnglish
Article number35
JournalAstrophysical Journal Supplement
Issue number2
Early online date5 Dec 2022
Publication statusPublished - 5 Dec 2022


  • atomic physics
  • x-ray astronomy
  • atomic spectroscopy
  • astrophysical plasmas


Dive into the research topics of 'R -matrix electron-impact excitation data for the H- and He-like ions with Z = 6−30'. Together they form a unique fingerprint.

Cite this