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Cage diffusion in liquid mercury

Y. S. Badyal·U. Bafile·K. Miyazaki·I. M. de Schepper·W. Montfrooij
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Abstract

We present inelastic neutron scattering measurements on liquid mercury at room temperature for wave numbers $q$ in the range 0.3 $< q <$ 7.0 Å$^{-1}$. 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.

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Y. S. Badyal, U. Bafile, K. Miyazaki, I. M. de Schepper, W. Montfrooij. 2003-07-21. Cage diffusion in liquid mercury. https://doi.org/10.1103/physreve.68.061208

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