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.
- Publication:
-
Journal of Physics Condensed Matter
- Pub Date:
- February 2012
- DOI:
- 10.1088/0953-8984/24/6/064102
- Bibcode:
- 2012JPCM...24f4102M