Eur. Phys. J. Special Topics 141, 35-38 (2007)
https://doi.org/10.1140/epjst/e2007-00012-4

Study of the effects of confinement in the collective excitations of liquid deuterium

¹ Instituto de Ciencia de Materiales de Aragón, CSIC, Zaragoza, Spain and Institut Laue Langevin, Grenoble, France
² CNR-INFM, CRS-Soft and Institut Laue Langevin, Grenoble, France
³ Instituto de Estructura de la Materia, CSIC, Madrid, Spain
⁴ Dept. Electricity and Electronics, University of the Basque Country, Bilbao, Spain
⁵ European Synchrotron Radiation Facility, Grenoble, France
⁶ Facultad de Ciencias Químicas, Universidad Complutense, Madrid, Spain

Abstract

The spectrum of collective excitations of liquid deuterium in the bulk and confined within a MCM-41 matrix having pores of an average diameter of 2.4 nm has been studied by means of neutron scattering and molecular dynamics simulations. The main effects of confining liquid D₂ consist in a shift of the characteristic frequencies associated with damped density oscillations to higher energies. A strong decrease in diffusivity is also observed upon confinement.