The 6p3/2np states of barium have been observed for n values between 14 and 21. The energies, linewidths, and transition strengths have been measured and characterized in terms of one- and two-electron interactions, using a single-configuration approximation.
J. G. Story et al., "Spectroscopy of the 6p3/2np States of Barium," Physical Review A, vol. 39, no. 10, pp. 5127-5131, American Physical Society (APS), May 1989.
The definitive version is available at https://doi.org/10.1103/PhysRevA.39.5127
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