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Hyperfine structure in the 6snh (l = 5) Rydberg series of barium

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Abstract

The hyperfine structure in the odd-parity 6snh (9 ≤ n ≤ 40) Rydberg series of barium has been investigated, using a single cw ring dye laser and a beam of neutral atoms in the metastable 5d2 1G4 state. Owing to small fine-structure splitting, this hyperfine structure is dominated by the Fermi contact interaction of the 6s electron already at n = 12. The hyperfine-structure analysis results in a determination of the complete fine structure of the 6snh series as well as in values for the singlet–triplet mixing in the 6snh J =5 states. The 6snh series turn out to be perturbed by levels of the 5d4f configuration; J = 4 and J = 5 levels of this configuration have been observed. The Rydberg series perturbations are analyzed, using multichannel quantum-defect theory in the shifted R-matrix formalism. Far from the 5d4f perturbers, the 6snh configuration is almost purely jj coupled.

© 1989 Optical Society of America

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