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Journal Articles Chemical Physics Year : 2007

Quasielastic neutron scattering and microscopic dynamics of liquid ethylene glycol

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Abstract

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.

Dates and versions

insu-00347898 , version 1 (17-12-2008)

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Cite

O. Sobolev, A. Novikov, J. Pieper. Quasielastic neutron scattering and microscopic dynamics of liquid ethylene glycol. Chemical Physics, 2007, 334 (1-3), pp.36 à 44. ⟨10.1016/j.chemphys.2007.02.008⟩. ⟨insu-00347898⟩
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