2H NMR pure-quadrupole spectra for paramagnetic solids.

We report a simple two-dimensional NMR method for obtaining (2)H NMR pure-quadrupole spectra of paramagnetic solids. This method is based on a quadrupole-echo sequence inserted with 180° pulses, where the pulse spacings are incremented asymmetrically so that the (2)H 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 (2)H NMR spectra.