Experimental determination of the nature of diffusive motions of water molecules at low temperatures.

摘要: Extensive and high-quality quasi-elastic incoherent neutron scattering data were obtained for water in the temperature range extending from room down to -20 \ifmmode^\circ\else\textdegree\fi{}C supercooled state. The analysis generally confirms findings of our previous experiment [S. H. Chen, J. Teixeira, R. Nicklow, Phys. Rev. A 26, 3477 (1982)], but particular three new results have been obtained: (a) two relaxation times are clearly identified, which related short-time intermediate-time diffusion molecules, respectively, their dependence has determined; (b) one these is associated with jump protons, length qualitatively (c) Q intensity integrated over region gives a Debye-Waller factor independent.