Dynamics of argon in confined geometry
Forschungszentrum Jülich, 52425 Jülich, Germany
2 Universität des Saarlandes, 66041 Saarbrücken, Germany
3 Institut Laue-Langevin, 38042 Grenoble, France
4 Universität Regensburg, 93040 Regensburg, Germany
The role of geometrical confinement on the dynamics of argon is studied. We have investigated 36Argon adsorbed in nanoporous Gelsil glass by inelastic neutron scattering. By fractional filling the `dimensionality' of the system is tuned from a two-dimensional towards the bulk state. Ab-initio calculations of plane sheets of Ar atoms and of bulk Ar are compared to the experimental results. A shift of various phonon modes to lower energies with decreasing dimensionality is observed in the results of both methods.
© EDP Sciences, Springer-Verlag, 2007