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Extensive new results for the natural radiative lifetimes of the perturbed odd-parity 6snf  3 F 3 ,  1 F 3 , and  3 F 4  sequences of barium (with 11 &lt; n &lt; 40, 11 &lt; n &lt; 40 and 13 &lt; n &lt; 40, respectively) have been calculated. The calculations were performed in the framework of multichannel quantum defect theory. The contributions to the transition probabilities of all known even-parity levels of the 6snd and 6sng configurations together with their perturber states and connected via the electric dipole operator with the 6snf  3 F,  1 F 3 , and  3 F 4  levels, are considered.

Radiative Lifetimes of The Perturbed 6snf 3 F 3 , 1 F 3 , and 3 F 4 Rydberg Sequences of Barium