Time-Differential Quadrupole Interactions following Recoil Implantation

The quadrupole interaction of the 247-keV state of ${}_{}{}^{111}{}_{}{}^{}\mathrm{Cd}$ recoil implanted into polycrystalline Cd metal has been measured by the time-differential perturbed angular-correlation technique, following Coulomb excitation. The resulting interaction frequencies at three temperatures are in agreement with the recently measured lattice quadrupole interaction in Cd. This observation of a usable electric field gradient for recoil nuclei suggests the possibility of measuring excited-state quadrupole moments by such time-differential studies following nuclear-reaction implantation into metals.