Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 115, Issue 19, Pages 8942-8948Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1412249
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We use femtosecond two-color mid-infrared spectroscopy to study the dynamics of aqueous solutions of salts in HDO:D2O. We find that the lifetime of the O-H stretch vibration of HDO molecules in the solvation shell of the halogenic anions Cl-, Br-, and I- is much longer than the lifetime of the O-H stretch vibration of the HDO molecule in bulk D2O solution. This difference in lifetime allows for a clear separation of the response of the solvation shell from that of the bulk liquid. A detailed investigation of the spectral dynamics of the solvating HDO molecules reveals that the hydrogen-bond dynamics of these molecules are much slower than the hydrogen-bond dynamics of bulk liquid water. (C) 2001 American Institute of Physics.
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