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 language | English |
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Article number | 064102 |
Journal | Journal of Physics Condensed Matter |
Volume | 24 |
Issue number | 6 |
DOIs | |
State | Published - Feb 15 2012 |