Refocussing of Chemical and Paramagnetic Shift Anisotropies in ²H NMR Using the Quadrupolar-Echo Experiment

Abstract
A simple two-pulse spin-echo experiment is shown to refocus inhomogeneous broadening arising from both chemical and/or paramagnetic shift anisotropy and a first-order I = 1 quadrupolar interaction. The method is shown to yield ²H NMR spectra of a paramagnetic solid (CuCl₂.2D₂O) and of a non-paramagnetic solid (D₂C₂O₄.2D₂O) that are significantly less distorted than those provided by the conventional quadrupolar-echo method. The technique will thus prove useful in studies of motion and dynamics where detailed analysis of the ²H lineshape is performed.