Optical pumping with the 2537 Å intercombination line of mercury has been used to orient four nuclear spin $I=\frac{13}{2}$ isomers of mercury and two $I=\frac{1}{2}$ radiosiotopes as well as stable $I=\frac{1}{2}$ ${}_{}{}^{199}{}_{}{}^{}\mathrm{Hg}$ and $I=\frac{3}{2}$ ${}_{}{}^{201}{}_{}{}^{}\mathrm{Hg}$. Measurements of ratios of the nuclear-magnetic-resonance frequencies of these isotopes to that of ${}_{}{}^{199}{}_{}{}^{}\mathrm{Hg}$ contained in the same sample cell have been made. The results are:

Independent measurements also give $\frac{{\nu }_{195m}}{{\nu }_{195}}=0.148\mathrm{}4051\left(3\right)\mathrm{}$ and $\frac{{\nu }_{197m}}{{\nu }_{197}}=0.149\mathrm{}8984\left(3\right)\mathrm{}$. Values of $A\left({}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{}\right)$ are combined with the above ratios to give differential hyperfine-structure anomalies. Magnetic moments and hyperfine-structure anomalies are calculated by means of a nuclear configuration-mixing model and compared with the experimental results.

• Received 2 January 1973

DOI:https://doi.org/10.1103/PhysRevC.7.2065