Abstract
The hyperfine structure of the four lowest levels5F5, 4, 3, 2 of the5F ground state multiplet arising from the configuration 4d7 5s in99Ru and101Ru has been studied by the atomic — beam magnetic — resonance technique. After applying corrections due to the effects of off-diagonal hyperfine mixing we obtain the following multipole interaction constants:99Ru:A(5F5)=−204.5514(33) MHzB(5F5)=27.281 (62) MHzA5F4=−163.6845(36) MHzB(5F4)=17.455(52) MHzA5F3=−135.0294(37) MHzB(5F3)=10.164(50) MHzA(5F2)=− 82.5325(27) MHzB(5F2)=5.457(22) MHz101Ru:A(5F5)=−229.2881(33) MHzB(5F5)=158.934(62) MHzA(5F4)=−183.4744(36) MHzB(5F4)=101.799(52) MHzA(5F3)=−151.3502(38) MHzB(5F3)=59.323(50) MHzA(5F2)=−92.4974(27) MHzB(5F2)=31.869(23) MHz. The magnetic dipole and the electric quadrupole moments of the99Ru and101Ru nuclear ground states as calculated from these constants are the following:μ I (99Ru)=−0.594(119) nmQ(99Ru)=0.077 (15) barnsμ I (101Ru)=−0.666(133)nmQ(101Ru)=0.45 (9) barns. From measurements of the Zeeman effect in the even isotope102Ru we find the followingg J -factors for the5F ground multiplet:g J (5F5)=1.397741(20)g J (5F4)=1.347604(20)g J (5F3)=1.248988(20)g J (5F2)=1.001120(3).
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