Abstract
The atomic-beam magnetic-resonance method in combination with the triple resonance technique has been used to determine the nuclear magnetic dipole moments of99Ru and101Ru. The moments are deduced fromrf transition measurements in the5F5 and5F4 states at magnetic fields between 770 and 2400 Oe. In order to reduce the part of the uncertainty of the moments which arises from the uncertainty of the hyperfine structure constants more precise values of the constants than those available up to now were determined from low field measurements. After making corrections for hyperfine and Zeeman interactions with neighbouring atomic states we obtain the following values for the magnetic dipole moments:μ 99=−0.6381 (51)μ N andμ 101=−0.7152 (60)μ N (uncorrected for diamagnetic shielding). The results of the present work combined with the results of an earlier hyperfine structure investigation in the5F multiplet are analysed with respect to the effective-operator formalism. From this analysis we obtain the following values for the electric quadrupole moments:Q 99=0.076 (7) b andQ 101=0.44 (4) b (uncorrected for Sternheimer shielding or antishielding).
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