title: Experimental observation of the alpha relaxation in supercooled water
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.
authors.affiliation: Laboratoire Leon Brillouin, CEA-CNRS, CEA Saclay, 91191 Gif sur Yvette, France.
authors.initials: MC
authors.lastname: Bellissent-Funel
authors.initials: S
authors.lastname: Longeville
authors.initials: JM
authors.lastname: Zanotti
authors.initials: SH
authors.lastname: Chen