Emission Lines of Fe xiv, Fe xv, and Fe xvi in the Extreme Ultraviolet Region 40–100 Å

Abstract

We report on emission spectra of iron in the extreme ultraviolet recorded at an electron density of ∼10 ^11 cm ^−3 on the Lawrence Livermore electron beam ion trap facility. We present a summary of the observed emission lines, including wavelengths and emission intensities, and present spectra of pure Fe xiv through Fe xvi emission derived from our measurements in the 40–100 Å wavelength range. We show that spectral models, especially the current version of CHIANTI v10.0, describe the M-shell emission from these three charge states of iron reasonably well, and we are able to verify several transitions in CHIANTI for the first time.

Keywords

• Stellar coronae
• Laboratory astrophysics
• Atomic spectroscopy
• Line positions