Channel interactions in the Ba 6djnlj′ autoionizing series forl=2, 3, and 4

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Abstract
We have used two-photon excitation of Ba 6snl Rydberg states to create Ba 6djnl autoionizing states. The excitation of the initial Rydberg states is performed using two, three, or four tunable dye lasers for l=2, 3, and 4 respectively. We have used very efficient laser pumping schemes for population of the 6snf and 6sng series. The 6djnl states exhibit a wide range of interseries interaction from large to negligible channel couplings. Furthermore, the quantum defects of all of the series have a pronounced energy dependence even in the absence of any coupling to other 6dj core channels. The perturbing series that is the source of the energy variation of the quantum defects is believed to belong to one or more 4fj′ core configurations. Each 6dnl series has been fit using a multiconfiguration quantum-defect theory model, and the results of the fits are generally in good agreement with the observed spectra.