Self-dynamics and collective dynamics of liquid mercury

Authors: Bove L. E.; Sacchetti F.; Petrillo C.; Dorner B.; Formisano F.; Sampoli M.; Barocchi F.

Source: Philosophical Magazine B, Volume 82, Number 3, 1 February 2002 , pp. 365-374(10)

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Abstract:

The low-momentum dynamics of liquid mercury has been investigated by means of inelastic neutron scattering and molecular dynamics (MD) simulations. Because of the rather high incoherent cross-section and the high mass of mercury, the measured dynamic structure factor is dominated by the self-correlation function, although the low-momentum collective dynamics are made accessible by the very good energy resolution of the experiment. Collective modes are clearly visible against the incoherent scattering up to a momentum transfer of 0.4 Å^-1 and the associated velocity is found to be 2200=200 m s^-1, well in excess of the sound velocity which is equal to 1470 m s^-1. The self-dynamics, as resulting from either the experiment or the MD simulations, turn out to be characterized by two time scales.

Language: English

Document Type: Research article

Publication date: 2002-02-01

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