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RESEARCH PRODUCT
Relaxation and phonons in viscous and glassy orthoterphenyl by neutron scattering
Eckhard BartschF. FujaraM. KiebelHans SillescuJoachim WuttkeWinfried Petrysubject
PhysicsCondensed matter physicsPhononScatteringIncoherent scatterNeutron scatteringCondensed Matter PhysicsElectronic Optical and Magnetic Materialssymbols.namesakeMode couplingDensity of statessymbolsRelaxation (physics)General Materials Sciencevan der Waals forcedescription
We present an extended set of incoherent neutron scattering measurements on the van der Waals liquido-terphenyl, obtained by time-of-flight and backscattering spectroscopy. In the supercooled liquid regime, data from three instruments are combined and analysed in terms of the selfcorrelationS(Q, t). In the time range 1...100 ps, the crossover from α-to β-relaxation is well described by the masterfunction of mode coupling theory, and fitted parameters are consistent with the previously established critical temperatureT c [Z. Phys. B83, 175 (1991)]. In the glassy regime, vibrations are harmonic and can be described by a density of states. Deviations at lowQ are quantitatively explained by a multiple scattering simulation. Throughout the article, experimental difficulties are discussed in some detail.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1993-09-01 | Zeitschrift f�r Physik B Condensed Matter |