2D Deuteron Exchange NMR and Stimulated Echoes: Molecular Dynamics of the Vacancy Diffusion in Polycrystalline Benzene

Abstract Since in crystalline benzene the unit cell consists of four differently oriented molecules, the vacancy diffusion is expected to go along with a corresponding molecular reorientation. Therefore, 2 H NMR is able to yield detailed information about the time scale and local geometry of this jump diffusion process. We have carried out 2 H NMR stimulated echo and 2D experiments. These data, their fit to calculated spectra, and a comparison between the (1D) stimulated echo treatment and the 2D analysis are presented.