2D DEUTERON EXCHANGE NMR AND STIMULATED ECHOES - MOLECULAR-DYNAMICS OF THE VACANCY DIFFUSION IN POLYCRYSTALLINE BENZENE

Since in crystalline benzene the unit cell consists of four differentl y oriented molecules, the vacancy diffusion is expected to go along wi th a corresponding molecular reorientation. Therefore, H-2 NMR is able to yield detailed information about the time scale and local geometry of this jump diffusion process. We have carried out H-2 NMR Stimulate d 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. (C) 1998 Academic Press.