Abstract
As part of an investigation of the electric quadrupole interaction (EQI) at impurity nuclei in non-cubic metals1, we have applied the time-differential perturbed-angular correlation (TDPAC) technique2 to the measurement of the EQI at a 111Cd impurity in several hosts. Since in most of the cases studied the 111In parent radioactivity is difficult to introduce in the host lattice by metallurgical means, we prepared all sources by implantation of the 111In activity. As a by-product of the investigation, therefore, we obtained information on the efficiency of the implantation process in providing dilute alloy systems with a large fraction of In impurity atoms at lattice sites which appear unique insofar as the EQI is concerned. This definition of uniqueness implies not only that the impurity site be a specific crystallographic position but also that it sees identical surroundings in the first few shells of neighbors.
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