Perturbed 6snd^1,3D₂ Rydberg Series of Neutral Barium

The Ba even-parity J = 2 spectrum has been studied by using an
autoionization approach. Energy levels of the Ba 6snd^1,3D₂ Rydberg states have been measured and interpreted by the multichannel quantum defect theory. The results are in good agreement with the previous studies.