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Quasielastic incoherent neutron scattering study of the rotational dynamics of the water molecules in analcime |
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| Authors: | C. M. B. Line B. Winkler M. T. Dove |
| Affiliation: | 1. Department of Earth Sciences, University of Cambridge, Downing Street, CB2 3EQ, Cambridge, UK 2. Institut Laue-Langevin, Avenue des Martyrs, B.P. 156, 9, Grenoble Cedex, France 3. Mineralogisch-Petrographisches Institut der Christian-Albrechts Universit?t, Olshausenstr. 40, D-24098, Kiel, Germany |
| Abstract: | The rotational motion of the water molecules in analcime has been investigated by quasielastic incoherent neutron scattering. Reorientational times vary from 65 ± 20 ps at 260 K to 26 ± 3 ps at 370 K, and the temperature dependence suggests an activation energy for reorientations of 780 ± 200 K. Measurements of the temperature dependence of the intensity of the elastic incoherent scattering indicate that there is no cooperative ordering at low temperatures, and that instead there is a gradual freezing-in of the motion of individual water molecules. |
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