Molecular dynamics in concentrated sugar solutions and glasses: an NMR field cycling study

The frequency dependence of the proton longitudinal relaxation time in conc entrated sugar in water solutions and glasses is compared with various theo retical models and used to derive correlation times characterizing the dyna mic state of the water and sugar. It is shown that the water retains a high degree of molecular mobility even in the 'sugar glass', while the spectral density of the 3-dimensional glass lattice shows no evidence for a distrib ution of correlation times.