2H NMR pure-quadrupole spectra for paramagnetic solids

We report a simple two-dimensional NMR method for obtaining H-2 NMR pure-quadrupole spectra of paramagnetic solids. This method is based on a quadrupole-echo sequence inserted with 18 degrees pulses, where the pulse spacings are incremented asymmetrically so that the H-2 magnetization evolves only by the quadrupole interaction in the indirect dimension. It is shown that when the sequence is carried out with strong radio-frequency pulses, the spectrum projected to the indirect dimension can be simulated using the quadrupole-echo sequence without considering the effect of the paramagnetic shift. The method was also used to investigate molecular dynamics by measurement and simulation of the temperature dependence of the H-2 NMR spectra. (C) 2014 Elsevier Inc. All rights reserved.