Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2003-07-21
Physics
Condensed Matter
Disordered Systems and Neural Networks
15 pages +5 figures
Scientific paper
10.1103/PhysRevE.68.061208
We present inelastic neutron scattering measurements on liquid mercury at room temperature for wave numbers $q$ in the range 0.3 $< q <$ 7.0 \AA$^{-1}$. We find that the energy halfwidth of the incoherent part of the dynamic structure factor $S(q,E)$ is determinded by a self-diffusion process. The halfwidth of the coherent part of $S(q, E)$ 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.
Badyal Y. S.
Bafile Ubaldo
de Schepper I. M.
Miyazaki Kunimasa
Montfrooij Wouter
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