Comment on: "Hyperfine structure measurements of Co I and Co II with Fourier transform spectroscopy" by Fu et al. [JQSRT 2021, 107590]

Abstract

This comment points out errors in the analysis of 61 magnetic hyperfine structure ($A$) constants of Co II energy levels by Fu et al. [JQSRT 2021, 107590]. The paper was published without full awareness of the extensive literature already available for Co II hyperfine $A$ constants at the time; 57 of 58 $A$ constants that were claimed to have been measured for the first time had already been measured by the prior work of Ding \& Pickering [ApJS 2020, 251:24], who had published $A$ constants for 292 levels of Co II. The $A$ constant of 3d${}^6$4s${}^2$ a${}^5$D${}_4$ has been determined by Fu et al. [JQSRT 2021, 107590] for the first time to be $12.0\pm 1.8$ mK (1 mK $=$ 0.001 cm${}^{-1}$), which was found to agree with line profiles observed by Ding \& Pickering [ApJS 2020, 251:24]. Discrepancies in 17 $A$ constants of Fu et al. [JQSRT 2021, 107590] were found, which are likely due to the analysis of weak, experimentally unclassified transitions with Ritz wavenumbers 25453.966 cm${}^{-1}$ and 25149.948 cm${}^{-1}$ by Fu et al. [JQSRT 2021, 107590] for the $A$ constants of the energy levels 3d${}^7$(${}^2$G)4s a${}^3$G${}_5$ and 3d${}^7$(${}^2$P)4s c${}^3$P${}_2$ respectively. Fewer transitions and poorer quality spectra analysed by Fu et al. [JQSRT 2021, 107590] are also concluded to have contributed to disagreements in the 17 $A$ constants.

References in corpus (1)

• Measurements of the Hyperfine Structure of Atomic Energy Levels in Co II