Wavelengths, Transition Probabilities, and Energy Levels for the Spectra of Barium (Ba III through Ba LVI)
Jean E. Sansonetti, John J. Curry
Energy levels, with designations and uncertainties, have been compiled for the spectra of barium (Z=56) ions from doubly-ionized to hydrogen-like. Wavelengths with classifications, intensities, and transition probabilities are also tabulated. In addition, ground states and ionization energies are listed. For many ionization stages experimental data are available; however for those for which only theoretical calculations or fitted values exist, these are reported. There are a few ionization stages for which only a calculated ionization potential is available.
and Curry, J.
Wavelengths, Transition Probabilities, and Energy Levels for the Spectra of Barium (Ba III through Ba LVI), J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904125
(Accessed November 29, 2023)