title: On the anomalous behaviour of microscopic diffusion of liquid water.
abstract: We propose here a new interpretation of recent quasi-elastic neutron scattering (QENS) measurements on water. A line-shape analysis based on a stretched exponential ansatz for the time decay of density fluctuations enabled us to observe an anomalous dependence on the exchanged momentum of relevant relaxation parameters. We discuss this effect and relate it to an a priori uncorrelated anomaly, previously evidenced by diffraction measurements.
authors.affiliation: CNR-INFM, Centro di Ricerca e Sviluppo SOFT, I-00185 Roma, Italy. OGG, Operative Group in Grenoble, 6 rue J. Horowitz, F-38042 Grenoble Cedex 9, France.
authors.forename: A
authors.initials: A
authors.lastname: Cunsolo
authors.forename: A
authors.initials: A
authors.lastname: Orecchini
authors.forename: C
authors.initials: C
authors.lastname: Petrillo
authors.forename: F
authors.initials: F
authors.lastname: Sacchetti