Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 17, Pages 3644-3647Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.3644
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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 e-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 couplings idea in supercooled water.
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