Electric-field-gradient tensor orientation for As and Ge atoms inα-gallium

The electric-field-gradient tensor at the site of the impurity atoms ${}_{}{}^{71}{}_{}{}^{}$,73As and ${}_{}{}^{69}{}_{}{}^{}\mathrm{Ge}$ in orthorhombic gallium was measured by the time-differential perturbed angular distribution method. To analyze the spectra for the long-lived ${}_{}{}^{73}{}_{}{}^{}\mathrm{As}$ isomer, an autocorrelation technique was developed. The tensor orientations found are quite different from those observed for Ga lattice atoms and Cd impurities.