A two-step process using internal conversion and fluorescence to stabilize the 6P3/211d autoionizing state of barium has been observed. The internal conversion produces very highly excited autoionizing Rydberg states, which then emit fluorescence to produce singly excited, bound states. Inclusion of this process should bring calculations closer to agreement with recent measurements of dielectronic recombination.
J. G. Story et al., "Two-Step Stabilization of Autoionizing States," Physical Review A, vol. 34, no. 5, pp. 4508-4510, American Physical Society (APS), Nov 1986.
The definitive version is available at https://doi.org/10.1103/PhysRevA.34.4508
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