R-matrix Electron-impact Excitation Data for the H- and He-like Ions with Z = 6-30
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.
- Publication:
-
The Astrophysical Journal Supplement Series
- Pub Date:
- December 2022
- DOI:
- 10.3847/1538-4365/ac9c57
- arXiv:
- arXiv:2210.13427
- Bibcode:
- 2022ApJS..263...35M
- Keywords:
-
- Atomic physics;
- X-ray astronomy;
- Atomic spectroscopy;
- 2063;
- 1810;
- 2099;
- Physics - Atomic Physics;
- Astrophysics - High Energy Astrophysical Phenomena;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- ApJS accepted