Nuclear Quadrupole Interaction ofSb121andSb123in Antimony Metal

The five nuclear quadrupole resonances of ${\mathrm{Sb}}^{121}$ and ${\mathrm{Sb}}^{123}$ have been measured at 4.2°K giving the quadrupole couplings $eqQ=76.867\mathrm{}\pm 0.001 \mathrm{and} 97.999\pm 0.001$ Mc/sec, respectively. The temperature dependence of the interaction has been measured from 2 to 480°K. Both isotopes have the same temperature dependence of $\left(\frac{1}{\nu }\right)\left(\frac{d\nu }{\mathrm{dT}}\right)\approx 2.4\times {10}^{-4\mathrm{}}$°${\mathrm{K}}^{-1\mathrm{}}$. The ionic field gradient provides about 10% of this measured quadrupole coupling.