001023117 001__ 1023117
001023117 005__ 20240619092102.0
001023117 037__ $$aFZJ-2024-01687
001023117 041__ $$aEnglish
001023117 1001_ $$0P:(DE-Juel1)131067$$aZorn, Reiner$$b0$$eCorresponding author$$ufzj
001023117 1112_ $$aThe 15th International Conference on Muon Spin Rotation, Relaxation and Resonance$$cParma$$d2022-07-06 - 2022-07-10$$gμSR2020$$wItaly
001023117 245__ $$aMicroscopic Dynamics of Structural Glasses Investigated by Quasielastic Neutron Scattering
001023117 260__ $$c2022
001023117 3367_ $$033$$2EndNote$$aConference Paper
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001023117 520__ $$aIn 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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001023117 65017 $$0V:(DE-MLZ)GC-2004-2016$$2V:(DE-HGF)$$aBasic research$$x0
001023117 693__ $$0EXP:(DE-MLZ)J-NSE-20140101$$1EXP:(DE-MLZ)FRMII-20140101$$5EXP:(DE-MLZ)J-NSE-20140101$$6EXP:(DE-MLZ)NL2ao-20140101$$aForschungs-Neutronenquelle Heinz Maier-Leibnitz $$eJ-NSE: Neutron spin-echo spectrometer$$fNL2ao$$x0
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001023117 9201_ $$0I:(DE-Juel1)IBI-8-20200312$$kIBI-8$$lNeutronenstreuung und biologische Materie$$x1
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