%0 Journal Article %T Quasielastic neutron scattering and microscopic dynamics of liquid ethylene glycol %+ Laboratoire de Géophysique Interne et Tectonophysique (LGIT) %+ Institute for Physics and Power Engineering %+ Technical University of Berlin / Technische Universität Berlin (TU) %A Sobolev, O. %A Novikov, A. %A Pieper, J. %< avec comité de lecture %@ 0301-0104 %J Chemical Physics %I Elsevier %V 334 %N 1-3 %P 36 à 44 %8 2007 %D 2007 %R 10.1016/j.chemphys.2007.02.008 %K Quasielastic neutron scattering %K Ethylene glycol %K DiffusionJournal articles %X Quasielastic neutron scattering (QENS) by liquid ethylene glycol was analyzed using different model approaches. It was found that approximation of the QENS spectra by a set of Lorentzian functions corresponding to the translational and rotational motions produce physically unrealistic results. At the same time, the Fourier transform of the stretched-exponential function exp(−(t/τ)β) fits the experimental data well, and results of the fit are in good agreement with those obtained earlier for other systems. The stretching parameter β was found Q independent and shows weak temperature dependence. The mean relaxation time as a function of Q departs strongly from the simple diffusion low and can be approximated by a power law left angle bracketτwright-pointing angle bracket = τ0Q−γ with the exponent parameter γ = 2.4. %G English %L insu-00347898 %U https://insu.hal.science/insu-00347898 %~ INSU %~ UNIV-SAVOIE %~ UGA %~ CNRS %~ UNIV-GRENOBLE1 %~ INPG %~ IRSTEA %~ IFSTTAR %~ AGREENIUM %~ INRAE %~ USMB-COMUE %~ UNIV-EIFFEL %~ IFSTTAR-UNIVEIFFEL