R. Bohmer et al., DYNAMIC HETEROGENEITY IN SUPERCOOLED ORTHO-TERPHENYL STUDIED BY MULTIDIMENSIONAL DEUTERON NMR, Europhysics letters, 36(1), 1996, pp. 55-60
Using deuteron NMR, we have studied molecular reorientation rates and
rate exchange processes in supercooled ortho-terphenyl. We monitor the
re-equilibration of differently selected subensembles through four-ti
me stimulated echo experiments. A comparison of the two-time with the
four-time echoes suggests that the characteristic time scales for reor
ientation and dynamical exchange are relatively similar. The four-time
correlation functions were described using various multi-state rate e
xchange models.