Abstract
The hyperfine structure (hfs) of the 5d ${\mathrm{}}^{2}$${D}_{5/2}$ $^{135}$,137Ba ions has been measured by collinear fast-beam laser-rf double-resonance spectroscopy, completing the high-precision hfs data for the metastable $^{2}\mathrm{D}_{3/2}$,5/2 doublet. hfs constants, corrected for second-order hfs perturbation, are deduced and compared with the results of many-body perturbation theory. Nuclear quadrupole moments are extracted.
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