6533b856fe1ef96bd12b245a
RESEARCH PRODUCT
Fast Local Motion around T g in a Molecular Glass as Observed by Incoherent Neutron Scattering
F. FujaraWinfried Petrysubject
Materials scienceCondensed matter physicsbusiness.industryScatteringPhononIncoherent scatterGeneral Physics and AstronomyInelastic scatteringNeutron scatteringInelastic neutron scatteringOpticsbusinessStructure factorGlass transitiondescription
Incoherent quasi-elastic neutron scattering experiments on a molecular glass (1,3,5-tri-α-naphtylbenzene, C36H24) are reported. We find clear evidence for an anomalously strong decrease of the elastic and a corresponding increase of the inelastic scattering around the glass transition temperature. The line shape of this extra inelastic intensity gives evidence for a quasi-elastic scattering implying the existence of a localized and fast (τc ≈ 4.10-12s) molecular motion. From the elastic incoherent structure factor (EISF) a mean jump length ≤ 0.6 A is estimated. The significance of this motion as precursor of the glass instability is discussed within the framework of dynamic glass transition theories.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1987-10-15 | Europhysics Letters (EPL) |