Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5376342 | Chemical Physics | 2007 | 9 Pages |
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(â(t/Ï)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 ãÏwã = Ï0Qâγ with the exponent parameter γ = 2.4.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
O. Sobolev, A. Novikov, J. Pieper,