Nuclear Electric Quadrupole Resonance inβ-Gallium

Abstract

The quadrupole resonances of ${}_{}{}^{69}{}_{}{}^{}\mathrm{Ga}$ and ${}_{}{}^{71}{}_{}{}^{}\mathrm{Ga}$ have been observed in $\beta$-gallium in a silicone oil dispersion. The resonance frequencies are 6.25 and 3.91 MHz for ${}_{}{}^{69}{}_{}{}^{}\mathrm{Ga}$ and ${}_{}{}^{71}{}_{}{}^{}\mathrm{Ga}$, respectively, at 77°K. The ${}_{}{}^{69}{}_{}{}^{}\mathrm{Ga}$ frequency ${\nu }_Q$ was measured as a function of temperature up to the melting point of - 16.3°C, and over that range of temperatures the average value of $\frac{{{\nu }_Q}^{-1\mathrm{}}d{\nu }_Q}{\mathrm{dt}}$ was - 0.2%/°K, 20 times larger than the corresponding value for orthorhombic $\alpha$-gallium.