Self-dynamics and collective dynamics of liquid mercury

Details Self-dynamics and collective dynamics of liquid mercury Self-dynamics and collective dynamics of liquid mercury

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pmagb..82..365b&link_type=abstract

Philisophical Magazine B, vol. 82, Issue 3, p.365-374

Computer Science

Sound

7

Scientific paper

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.

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