Water dynamics in a lithium chloride aqueous solution probed by Brillouin neutron and x-ray scattering

E. Mamontov, A. De Francesco, F. Formisano, A. Laloni, L. Sani, B. M. Leu, A. H. Said, A. I. Kolesnikov

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Abstract

We studied the collective excitations in an aqueous solution of lithium chloride over the temperature range of 270-205K using neutron and x-ray Brillouin scattering. Both neutron and x-ray experiments revealed the presence of low-and high-frequency excitations, similar to the low-and high-frequency excitations in pure water. These two excitations were detectable through the entire temperature range of the experiment, at all probed values of the scattering momentum transfer (0.2 Å -1 < Q < 1.8Å -1). A wider temperature range was investigated using elastic intensity neutron and x-ray scans. Clear evidence of the crossover in the dynamics of the water molecules in the solution was observed in the single-particle relaxational dynamics on the νeV (nanosecond) time scale, but not in the collective dynamics on the meV (picosecond) time scale.

Original languageEnglish
Article number064102
JournalJournal of Physics Condensed Matter
Volume24
Issue number6
DOIs
StatePublished - Feb 15 2012

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