TY  - CONF
AU  - Zorn, Reiner
TI  - Microscopic Dynamics of Structural Glasses Investigated by Quasielastic Neutron Scattering
M1  - FZJ-2024-01687
PY  - 2022
AB  - In this presentation I will give a short introduction into quasielastic neutron scattering (QENS) and its application to glass-forming systems. QENS operates on time scales from picoseconds to a microsecond and at the same time has a spatial resolution in the Ångström range. Therefore, it is well suited for the study of molecular and polymeric glass-formers.The dynamics of glass-formers is still poorly understood, but certain universal features can be found which a theory has to explain. Foremost, there is the α relaxation, which governs what is usually called ‘glass transition’. Its temperature-dependence is highly non-Arrhenius and the shape of correlation functions non-exponential. In addition, faster relaxations may be present, among which the universal ‘fast β relaxation’ in the picosecond range is strongly related to the α relaxation in mode-coupling theory. As the fastest universal process, glasses show an excess of the vibrational density of states above the Debye model in the low frequency range, the so-called ‘boson peak’.All these phenomena can be observed by QENS with the additional information of a length scale. In addition, it is possible to study them in confined glass-formers in order to access their system-size-dependence. Selected QENS experiments will be presented and discussed.
T2  - The 15th International Conference on Muon Spin Rotation, Relaxation and Resonance
CY  - 6 Jul 2022 - 10 Jul 2022, Parma (Italy)
Y2  - 6 Jul 2022 - 10 Jul 2022
M2  - Parma, Italy
LB  - PUB:(DE-HGF)6
UR  - https://juser.fz-juelich.de/record/1023117
ER  -