title: Water dynamics in a lithium chloride aqueous solution probed by Brillouin neutron and x-ray scattering.
abstract: We studied the collective excitations in an aqueous solution of lithium chloride over the temperature range of 270-205 K 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 < 1.8 Å(-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 µeV (nanosecond) time scale, but not in the collective dynamics on the meV (picosecond) time scale.
authors.affiliation: Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
authors.forename: E
authors.initials: E
authors.lastname: Mamontov
authors.forename: A
authors.initials: A
authors.lastname: De Francesco
authors.forename: F
authors.initials: F
authors.lastname: Formisano
authors.forename: A
authors.initials: A
authors.lastname: Laloni
authors.forename: L
authors.initials: L
authors.lastname: Sani
authors.forename: B M
authors.initials: BM
authors.lastname: Leu
authors.forename: A H
authors.initials: AH
authors.lastname: Said
authors.forename: A I
authors.initials: AI
authors.lastname: Kolesnikov