The hyperfine structure (hfs} of the Sd D5/2 '3 ' 78a ions has been measured by collinear fast-beam laser-rf double-resonance spectroscopy, completing the high-precision hfs data for the metastable D3/2 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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