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Experimental Confirmation of the Universal Law for the Vibrational Density of States of Liquids

Journal Article


Abstract


  • An analytical model describing the vibrational density of states (VDOS) of liquids has long been elusive, owing to the complexities of liquid dynamics. Nevertheless, Zaccone and Baggioli have recently developed such a model which was proposed to be the universal law for the vibrational density of states of liquids. Distinct from the Debye law, g(ω) ∝ ω2, for solids, the universal law for liquids reveals a linear relationship, g(ω) ∝ ω, in the low-energy region. We have confirmed this universal law with experimental VDOS measured by inelastic neutron scattering on real liquid systems including water, liquid metal, and polymer liquids, and have applied this model to extract the effective relaxation rate for the short time dynamics for each liquid. The model has also been further evaluated in the prediction of the specific heat with comparison to existing experimental data as well as with values obtained by different approaches.

Publication Date


  • 2022

Citation


  • Stamper, C., Cortie, D., Yue, Z., Wang, X., & Yu, D. (2022). Experimental Confirmation of the Universal Law for the Vibrational Density of States of Liquids. Journal of Physical Chemistry Letters, 13(13), 3105-3111. doi:10.1021/acs.jpclett.2c00297

Scopus Eid


  • 2-s2.0-85128245834

Start Page


  • 3105

End Page


  • 3111

Volume


  • 13

Issue


  • 13

Abstract


  • An analytical model describing the vibrational density of states (VDOS) of liquids has long been elusive, owing to the complexities of liquid dynamics. Nevertheless, Zaccone and Baggioli have recently developed such a model which was proposed to be the universal law for the vibrational density of states of liquids. Distinct from the Debye law, g(ω) ∝ ω2, for solids, the universal law for liquids reveals a linear relationship, g(ω) ∝ ω, in the low-energy region. We have confirmed this universal law with experimental VDOS measured by inelastic neutron scattering on real liquid systems including water, liquid metal, and polymer liquids, and have applied this model to extract the effective relaxation rate for the short time dynamics for each liquid. The model has also been further evaluated in the prediction of the specific heat with comparison to existing experimental data as well as with values obtained by different approaches.

Publication Date


  • 2022

Citation


  • Stamper, C., Cortie, D., Yue, Z., Wang, X., & Yu, D. (2022). Experimental Confirmation of the Universal Law for the Vibrational Density of States of Liquids. Journal of Physical Chemistry Letters, 13(13), 3105-3111. doi:10.1021/acs.jpclett.2c00297

Scopus Eid


  • 2-s2.0-85128245834

Start Page


  • 3105

End Page


  • 3111

Volume


  • 13

Issue


  • 13