On the Nuclear Magnetic Moments of the Isotopes of Rubidium and Chlorine

The molecular beam, magnetic resonance method has been applied to the measurement of the nuclear gyromagnetic ratios of ${\mathrm{Rb}}^{87}$, ${\mathrm{Rb}}^{85}$, ${\mathrm{Cl}}^{37}$ and ${\mathrm{Cl}}^{35}$. The $g$ values are 1.820±0.006, 0.536±0.002, 0.454±0.002 and 0.546±0.002, respectively. The magnetic moments of ${\mathrm{Rb}}^{87}$ and ${\mathrm{Rb}}^{85}$, obtained from the observed $g$ values and the known nuclear spins, are 2.741±0.009 and 1.345±0.005, respectively. The substantial agreement of the moment ratio $\frac{{\mu }_{87}}{{\mu }_{85}}$, 2.038, found by this method, with that obtained from atomic beam measurements indicates that any contribution to h.f.s. by a form of interaction between electron and nucleus not electromagnetic in character is small. A nuclear moment of 1.365±0.005 is obtained for ${\mathrm{Cl}}^{35}$ if one takes the band spectra spin value of 5/2 for this nucleus. No information concerning the spin of ${\mathrm{Cl}}^{37}$ is available.