Abstract
An optical double resonance experiment at high magnetic fields has determined ${g}_{J}$ for the $(5s5p)^{3}P_{1}$ level of the even cadmium isotopes to be 1.499846(13), and ${g}_{J}$ for the $(6s6p)^{3}P_{1}$ level of the even mercury isotopes to be 1.486094(8). Resonance was observed in all cases at a frequency of exactly 24 Gc/sec, and magnetic fields near 11 430 G. At these high fields the Zeeman energy is of the order of ${10}^{\ensuremath{-}3}$ of the fine structure separations of the triplet terms of the ($\mathrm{nsnp}$) configuration, and the $\ensuremath{\Delta}m=\ifmmode\pm\else\textpm\fi{}1$ transitions are split by 9.51(7) G for Cd, and by 2.99(7) G for Hg. This splitting represents several linewidths in the case of Hg, and many linewidths in that of Cd. The average field of the two $\ensuremath{\Delta}m=\ifmmode\pm\else\textpm\fi{}1$ transitions, however, determines ${g}_{J}$ to high precision independent of second-order corrections.
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