The electronic angular momenta of some low-lying states of cerium were determined by means of the atomic-beam magnetic resonance technique. The work was done on the 32-day ${\mathrm{Ce}}^{141}$ isotope using both the reported nuclear spin result of ${\mathrm{Ce}}^{141}$ ($I=\frac{7}{2}$) and the $g_J$ states as determined on ${\mathrm{Ce}}^{140}$. The results are: $g_J=-1.0772\mathrm{}$, $J=3\mathrm{}$; $g_J=-0.9454\mathrm{}$, $J=4\mathrm{}$; $g_J=-0.7651\mathrm{}$, $J=4\mathrm{}$. Configuration mixing is required to interpret these results. By the same experimental method the nuclear spin of ${\mathrm{Ce}}^{143}$ was determined. The result ($I=\frac{3}{2}$) is consistent with angular correlation data and decay schemes of this isotope.

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