Ground state hyperfine structure and nuclear magnetic dipole moments of177Hf and179Hf

Using the atomic beam magnetic resonance method the experimental hyperfine structure data of the 5d ²6s ^{2 3} F ₂ ground state of¹⁷⁷Hf and¹⁷⁹Hf described in a previous paper [1] have been completed. After applying corrections due to perturbations by other fine structure levels of the configuration 5d ²6s ² we got the following multipole interaction constants: $$begin{gathered} ^{177} Hf:A = 113.43314 (7) MHz B = 624.3293 (13) MHz hfill C = 0.27 (18) KHz D = 0.045 (40) KHz hfill ^{179} Hf: A = - 71.42891 (9) MHz B = 705.5181 (24) MHz hfill C = - 0.43 (20) MHz D = 0.07 (6) KHz. hfill end{gathered} $$ By measuring rf transitions at magnetic fields between 1100 and 1550 Gauss the nuclear ground state magnetic dipole moments were determined. The results are: $$mu _I (^{177} Hf) = 0.7836 (6) mu _N , mu _I (^{179} Hf) = - 0.6329 (13) mu _N $$ (uncorrected for diamagnetic shielding).