Nuclear Quadrupole Resonance of the Stable Gallium Isotopes

Eight absorption lines have been observed in a sample of polycrystalline Ga${\mathrm{Cl}}_3$. Of these, six are ascribed to the Cl isotopes. The remaining two, which are due to the stable gallium isotopes ${\mathrm{Ga}}^{69,71}$, allow us to determine the ratio of their quadrupole moments. $\frac{Q_{{\mathrm{Ga}}^{69}}}{Q_{{\mathrm{Ga}}^{71}}}=1.5867\mathrm{}\pm 0.0004$, in agreement with earlier atomic beam measurements.