Ground state hyperfine structure of⁹⁵Mo and⁹⁷Mo

Abstract

The hyperfine structure of the ground state 4d ⁵ 5s ⁷ S ₃ of⁹⁵Mo and⁹⁷Mo has been measured by the atomic beam magnetic resonance technique with the following results:⁹⁵Mo:A=−208.582060(10)MHz,B=37.050 (100) kHzC=−30 (10) Hz,D=−3 (3) Hz⁹⁷Mo:A=− 212.980930 (10) MHz,B−69.990(140)kHzC=−5 (10) Hz,D=0 (3) Hz. After application of corrections calculated according to second order perturbation theory, the hyperfine structure constants became:⁹⁵Mo: A_c=−208.582560(290)MHz,B _c =16.920(4300)kHzC _c=−30(270) Hz,D _c =− 3 (50) Hz⁹⁷Mo: A_c=212.981450(300) MHz,B _c =−90.780(4400)kHzC _c=−6(270) Hz,D _c =0 (50) Hz. With the known ratio ofg _I(⁹⁵Mo)/g _I(⁹⁷Mo) [1] a calculation of the hyperfine anomaly yields:₉₅ Δ ₉₇=−0.01009(17)%.

The ratio of the uncorrectedB factors isB(⁹⁷Mo)/B(⁹⁵Mo)=−1.8890(47). Because of the relatively large effects of second order hyperfine structure, the ratio of the correctedBfactors differs considerably from the ratio of the uncorrectedB factors. From the correctedB factors the electric quadrupole moments may be evaluated by means of calculated radial integrals [2]. The results are:Q (⁹⁵Mo)=−0.019(12)barns,Q(⁹⁷Mo)=0.102(39)barns.