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| Hauptseite > Publikationsdatenbank > Microscopic Dynamics of Structural Glasses Investigated by Quasielastic Neutron Scattering > print |
| Hauptseite > Publikationsdatenbank > Microscopic Dynamics of Structural Glasses Investigated by Quasielastic Neutron Scattering > print |
| 001 | 1023117 | ||
| 005 | 20240619092102.0 | ||
| 037 | _ | _ | |a FZJ-2024-01687 |
| 041 | _ | _ | |a English |
| 100 | 1 | _ | |a Zorn, Reiner |0 P:(DE-Juel1)131067 |b 0 |e Corresponding author |u fzj |
| 111 | 2 | _ | |a The 15th International Conference on Muon Spin Rotation, Relaxation and Resonance |g μSR2020 |c Parma |d 2022-07-06 - 2022-07-10 |w Italy |
| 245 | _ | _ | |a Microscopic Dynamics of Structural Glasses Investigated by Quasielastic Neutron Scattering |
| 260 | _ | _ | |c 2022 |
| 336 | 7 | _ | |a Conference Paper |0 33 |2 EndNote |
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| 520 | _ | _ | |a 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. |
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