Wavelength Measurements of Ni L‐Shell Lines between 9 and 15 A

Abstract

We present accurate wavelength measurements of nickel L-shell X-ray lines resulting from Δn ≥ 1 transitions between 9 and 15 Å. We have used the electron beam ion trap, SuperEBIT, at the Lawrence Livermore National Laboratory and a flat-field grating spectrometer to record the spectra. The most significant emission lines of Ni xix-xxvi in our spectral coverage are identified, and their relative intensities are determined. The resulting data set provides valuable input for the analyses of high-resolution X-ray spectra of stellar coronae sources, including the Sun. © 2007. The American Astronomical Society. All rights reserved.