Hyperfine structure and nuclear moments of99Ru and101Ru

Abstract

The atomic-beam magnetic-resonance method in combination with the triple resonance technique has been used to determine the nuclear magnetic dipole moments of 99Ru and l~The moments are deduced from rf transition measurements in the 5F s and 5F 4 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:

High precision hyperfine structure measurements in185Re and187Re

“…In this procedure we used the nuclear dipole moments given by Alder and Yu [11], and the following value for the electronic gj factor: g j= 1.951988(49). This is the weighted mean of the result Armstrong and Marrus obtained from their measurements in 186'188Re [-15] and our result: gs(6S5:2)=1.951950 (36). The uncertainty for the weighted mean is twice the standard deviation.…”

“…The hfs interaction constants A, B, C, and D were then extracted from the experimental data in the usual way [34,36] by calculating the transition frequencies as eigenvalue differences of the Hamiltonian for hyperfine and Zeeman interactions and fitting them to the observed resonance frequencies. In this procedure we used the nuclear dipole moments given by Alder and Yu [11], and the following value for the electronic gj factor: g j= 1.951988(49).…”

Magnetic-dipole hyperfine structure in 4d- and 5d-shell atoms

“…The table also includes results for 93Nb [12], 99Ru [13], l~ [14], lVSLu [ 15], and 179Hf [16]. Some pecularities concerning the single isotopes shall now be discussed: .…”

Ratio ofg I -factors and hyperfine structure anomalies of99Ru and101Ru

“…In Refs. [1] and [2] that part of a selectron is given, which contributes to the hyperfine structure in the different levels. One finds, that the coefficients of a s decrease in the same way as the HFSA given above.…”

“…Although very accurate values for the hyperfine structure interaction constants for the two ruthenium isotopes 99Ru and t~ are available for some atomic states [1,2] the determination of the hyperfine structure anomaly failed due to the fact, that the ratio of the gx-factors of both isotopes was not known accurately enough [3]. A measurement of the ratio of the gx-factors of the two ruthenium isotopes by the nuclear magnetic resonance method (NMR) is reported: The ruthenium isotopes 99Ru and l~ have both the spin I=5/2, a natural abundance of 12.7 % respective 17.1% and a Larmor frequency at 5.875 T of about 11.541 MHz and 12.935 MHz.…”