High-resolution neutron scattering measurement of the dynamic structure factor of heavy water

C. Petrillo, F. Sacchetti, B. Dorner, and J.-B. Suck
Phys. Rev. E 62, 3611 – Published 1 September 2000
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Abstract

The low momentum collective dynamics of heavy water has been investigated by means of neutron three-axis spectroscopy. Working at the resolution limit of this instrument, an energy resolution of 2.6 meV was achieved for a constant analyzer energy of 120 meV. This good resolution allowed us to establish definitely that the collective dynamics of water is dominated by the presence and interaction of opticlike and acousticlike branches, coupling at wave-vector transfers of 0.3 to 0.35 Å1. The transition from slow to fast sound has been attributed to the interaction between opticlike modes and a solidlike fast acoustic mode.

  • Received 20 December 1999

DOI:https://doi.org/10.1103/PhysRevE.62.3611

©2000 American Physical Society

Authors & Affiliations

C. Petrillo* and F. Sacchetti

  • Istituto Nazionale per la Fisica della Materia, Unitá di Perugia, Perugia, Italy
  • Dipartimento di Fisica, Università di Perugia, Via A. Pascoli, I-06123 Perugia, Italy

B. Dorner

  • Institut Laue Langevin, Boîte Postale 156, Grenoble, France

J.-B. Suck

  • Institute of Physics, Material Research and Liquids, TU Chemnitz, D-09107 Chemnitz, Germany

  • *Present address: Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 120133 Milano, Italy.

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Vol. 62, Iss. 3 — September 2000

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