4 research outputs found
Cage diffusion in liquid mercury
We present inelastic neutron scattering measurements on liquid mercury at
room temperature for wave numbers in the range 0.3 7.0 \AA.
We find that the energy halfwidth of the incoherent part of the dynamic
structure factor is determinded by a self-diffusion process. The
halfwidth of the coherent part of shows the characteristic behavior
expected for a cage diffusion process. We also show that the response function
at small wave numbers exhibits a quasi-elastic mode with a time scale
characteristic of cage diffusion, however, its intensity is larger by an order
of magnitude than what would be expected for cage diffusion. We speculate on a
scenario in which the intensity of the cage diffusion mode at small wave
numbers is amplified through a valence fluctuation mechanism.Comment: 15 pages +5 figure