Experimental Aspects of Multidimensional Exchange Solid-State NMR

Abstract

A five-pulse sequence for two-dimensional exchange 2H NMR that results in improved processability of the obtained spectra is presented, together with the phase cycle necessary to eliminate unwanted signal contributions. The scheme of the three-dimensional Fourier transformation to yield pure-absorption-mode three-dimensional 2H NMR spectra is presented, and the off-resonance measurement of multidimensional 2H NMR experiments is discussed. Furthermore, the phase cycles of six- and eight-pulse sequences for the acquisition of undistorted three-dimensional 2H NMR spectra are derived from the phase cycles of the 2D pulse sequences. Differences in the phase cycles for spin-12 nuclei, such as 13C, and spin-1 nuclei, such as 2H, are explicitly addressed.