6 Citations (Scopus)

Abstract

We have measured Brillouin spectra of LiCl aqueous solutions as a function of concentration. A classical model of phonons damped by a viscous loss process does not describe the spectra adequately. They are better described by a coupled mode system consisting of a phonon and a relaxation mode of water molecules in the ionic hydration shell. The hydration shell relaxation is well-described by a single relaxation time which, for example, is 24 ps at 36 mol % LiCl. The relaxation time and the coupling strength depend on the concentration, which indicates that the dynamic properties of the water molecules in the ionic hydration shell are affected by interionic interactions.

Original languageEnglish (US)
Pages (from-to)5855-5857
Number of pages3
JournalJournal of Physical Chemistry
Volume92
Issue number21
StatePublished - 1988

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Inelastic scattering
Phonons
Hydration
Light scattering
hydration
inelastic scattering
phonons
light scattering
Acoustics
aqueous solutions
Relaxation time
acoustics
relaxation time
Brillouin scattering
Molecules
Water
dynamic characteristics
water
coupled modes
molecules

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

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title = "Coupling of acoustic phonons in LiCl aqueous solutions to a relaxation mode of the ionic hydration shell and observation of central peaks in inelastic light scattering",
abstract = "We have measured Brillouin spectra of LiCl aqueous solutions as a function of concentration. A classical model of phonons damped by a viscous loss process does not describe the spectra adequately. They are better described by a coupled mode system consisting of a phonon and a relaxation mode of water molecules in the ionic hydration shell. The hydration shell relaxation is well-described by a single relaxation time which, for example, is 24 ps at 36 mol {\%} LiCl. The relaxation time and the coupling strength depend on the concentration, which indicates that the dynamic properties of the water molecules in the ionic hydration shell are affected by interionic interactions.",
author = "Nongjian Tao and Stuart Lindsay",
year = "1988",
language = "English (US)",
volume = "92",
pages = "5855--5857",
journal = "Journal of Physical Chemistry",
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TY - JOUR

T1 - Coupling of acoustic phonons in LiCl aqueous solutions to a relaxation mode of the ionic hydration shell and observation of central peaks in inelastic light scattering

AU - Tao, Nongjian

AU - Lindsay, Stuart

PY - 1988

Y1 - 1988

N2 - We have measured Brillouin spectra of LiCl aqueous solutions as a function of concentration. A classical model of phonons damped by a viscous loss process does not describe the spectra adequately. They are better described by a coupled mode system consisting of a phonon and a relaxation mode of water molecules in the ionic hydration shell. The hydration shell relaxation is well-described by a single relaxation time which, for example, is 24 ps at 36 mol % LiCl. The relaxation time and the coupling strength depend on the concentration, which indicates that the dynamic properties of the water molecules in the ionic hydration shell are affected by interionic interactions.

AB - We have measured Brillouin spectra of LiCl aqueous solutions as a function of concentration. A classical model of phonons damped by a viscous loss process does not describe the spectra adequately. They are better described by a coupled mode system consisting of a phonon and a relaxation mode of water molecules in the ionic hydration shell. The hydration shell relaxation is well-described by a single relaxation time which, for example, is 24 ps at 36 mol % LiCl. The relaxation time and the coupling strength depend on the concentration, which indicates that the dynamic properties of the water molecules in the ionic hydration shell are affected by interionic interactions.

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