Abstract
Perturbed angular correlations are a widely used technique for the investigation of magnetic hyperfine interactions. It has been applied in the past to many cases, and magnetic dipole moments of excited states have been determined as well as magnetic hyperfine fields. The same technique is applicable to the study of electric quadrupole interactions. Although this is known since many years, the application has been restricted to a rather small number of cases up to now and only a very few electric quadrupole moments have been derived. This has a very simple explanation. In contrary to the magnetic hyperfine interaction, the highest available external electric field gradients are by many orders of magnitude too small to cause a measurable perturbation. One must therefore use internal electric field gradients in atoms, molecules, or crystals and a reliable calculation as well as a reliable calibration of these internal field gradients is today still quite difficult.
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