Experimental observation of the alpha relaxation in supercooled water |
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Authors: | Bellissent-Funel Longeville Zanotti Chen |
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Institution: | Laboratoire Leon Brillouin, CEA-CNRS, CEA Saclay, 91191 Gif sur Yvette, France. |
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Abstract: | Intermediate scattering functions for density fluctuation in D2O contained in pores of a Vycor glass have been measured using an improved neutron spin-echo spectrometer at two supercooled temperatures. The measurements cover the time range from 1 to 2300 ps with the Q range spanning the first diffraction peak of water. The time correlation functions can be fitted to a stretched exponential relaxation function with a Q-dependent amplitude. Both the stretch exponent and the relaxation time peak approximately at the Q value corresponding to the first diffraction peak, confirming the validity of the mode coupling idea in supercooled water. |
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