C. Schmidt, B. Blümich, H. Spiess
Sep 1, 1988
Citations
1
Influential Citations
149
Citations
Quality indicators
Journal
Journal of Magnetic Resonance
Abstract
Abstract The deuteron two-dimensional exchange experiment for the study of slow molecular motions in polycrystalline and amorphous solids is presented. A pair of four-pulse sequences for obtaining pure phase 2D spectra of a spin I = 1 system and phase cycles for minimizing artifacts are derived from spin dynamics calculations. A comprehensive description of the experiment and the 2D data processing is given. The information content of 2D exchange spectra of powders is discussed. For discrete jump motions, 2D powder spectra exhibit characteristic ridge patterns originating from the singularities of the 2D lineshape. From the geometry of such ridge patterns the angles of reorientation of the electric field gradient tensors can be determined directly, thus yielding information about the type of motion. The method is illustrated by two examples: the two-site jump of dimethyl sulfone and the six-site jump of hexamethylbenzene.