14 March 2013 THz Raman spectra of aqueous solutions of hydrophiles and amphiphiles
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Abstract
The ultrafast dynamics of water and aqueous solutions are probed by the optical Kerr effect (OKE). The translational origin of water dynamics observed by the OKE is described. The ultrafast response can be described by H-bond stretching and bending modes. These modes are persistent to unexpectedly high solute concentrations, where most water molecules are in a solvation shell. In some cases this suggests the formation of water clusters. All solutes slow the dynamics observed by OKE. Hydrophilic solutes give rise to a larger retardation of water dynamics than hydrophobic ones. These trends persist in molecular solutes, peptides and proteins.
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Ismael A. Heisler, Kamila Mazur, Steve R. Meech, "THz Raman spectra of aqueous solutions of hydrophiles and amphiphiles", Proc. SPIE 8623, Ultrafast Phenomena and Nanophotonics XVII, 862302 (14 March 2013); doi: 10.1117/12.999980; https://doi.org/10.1117/12.999980
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