Abstract
Incoherent neutron-backscattering and field gradient NMR are combined to measure the self-correlation function of protons in glycerol. Extensive simulations reveal and delimit systematic effects of multiple scattering. At microscopic wave numbers, tagged-particle motion couples strongly to structural relaxation. Between 1 and 0.1 A${\mathrm{\r{}}}^{\mathrm{\ensuremath{-}}1}$ a crossover to diffusional motion is observed: quasielastic stretching diminishes and the wave-number dependence of the mean relaxation time approaches ${\mathit{q}}^{\mathrm{\ensuremath{-}}2}$. \textcopyright{} 1996 The American Physical Society.
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