6533b82dfe1ef96bd1290a5c
RESEARCH PRODUCT
Isotope effects on the dynamics of a supercooled van der Waals liquid
Hans SillescuT. JörgHerbert ZimmermannRoland Böhmersubject
Materials scienceIsotopeSpin–lattice relaxationGeneral Physics and AstronomyCondensed Matter::Disordered Systems and Neural Networks530symbols.namesakeDeuteriumChemical physicsKinetic isotope effectsymbolsPhysical chemistryMoleculevan der Waals forcePhysics::Chemical PhysicsSupercoolingGlass transitionAstrophysics::Galaxy Astrophysicsdescription
Deuteron magnetic resonance was used to study three differently isotope-labeled species of the fragile glass-forming liquid ortho-terphenyl. The calorimetric glass transition of the isotope deuterated only at the central phenyl ring is significantly lower than that of the perdeuterated one. It is shown that while the ortho-terphenyl molecule is not as rigid as previously often assumed, its overall reorientation geometry is independent of deuteration. The characteristic jump angles are found to increase with temperature, thus resolving an apparent discrepancy previously noted when comparing typical jump sizes from NMR with other data.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-03-15 |