期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 24, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/24/6/064102
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资金
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
- US Department of Energy [DE-AC0500OR22725]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DEAC02-06CH11357]
- NSF [DMR-0115852]
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 angstrom(-1) < Q < 1.8 angstrom(-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 mu eV (nanosecond) time scale, but not in the collective dynamics on the meV (picosecond) time scale.
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