Measurements of Quadrupole Interactions by Nuclear Orientation and Quadrupole-Interaction-Resolved NMR on Oriented Nuclei

Abstract

The techniques of quadrupole-interaction nuclear-orientation and quadrupole-interaction-resolved NMR on oriented nuclei were applied to radioactive 111In (T1/2 = 2.8 d), 198Au (T 1/2 = 2.7 d) and 199Au (T1/2 = 3.1 d), mass-separator-implanted into single crystals of hep Co and hep Gd. For 111InGd the quadrupole interaction was observed via the broadening of the resonance and the dependence of the effective quadrupole interaction on the angle θ between the c-axis of the single crystal and the direction of magnetization. For 198AuGd the large electric field gradient known from the literature could not be confirmed. For 198AuCo and 199AuCo the quadrupole substructure has been resolved, and the electric field gradient of Au in hep Co was determined to be -0.84(4) x 1017 V/cm2. The magnetic hyperfine fields of Au in hep and fee Co differ by about 20%. These experiments have shown that hep Co may be a good host matrix for the determination of the quadrupole interaction of heavy radioactive nuclei with resonance precision.