Comprehensive Observations of the Ultraviolet Spectrum and Improved Energy Levels for Singly-Ionized Chromium (Cr II)
Craig J. Sansonetti, Gillian Nave, Joseph Reader, Florian Kerber
We report new observations of the spectrum of singly-ionized chromium (Cr II) in the region 1142 A to 3954 A. The spectra were recorded with the National Institute of Standards and Technology 10.7 m normal-incidence vacuum spectrograph and the FT700 vacuum ultraviolet Fourier transform spectrometer.More than 3600 lines are classified as transitions among 283 even and 368 odd levels. The new spectral data are used to re-optimize the energy levels, reducing their uncertainties by a typical factor of 20.
, Nave, G.
, Reader, J.
and Kerber, F.
Comprehensive Observations of the Ultraviolet Spectrum and Improved Energy Levels for Singly-Ionized Chromium (Cr II), Astrophysical Journal Supplement Series, [online], https://doi.org/10.1088/0067-0049/202/2/15
(Accessed September 26, 2023)