Roman spectra O-H and O-D stretching bands of water were reexamined carefully in the temperature range of 0-80℃ and analyzed in terms of the six Gaussian components to extract the temperature dependent hydrogen-bonding effects on the Raman band shape of water.
These O-H and O-D bands of water were studied by Surface Enhanced Raman Scattering (SERS) in the electrolyte solutions of various electrolytic concentration. We could observe SERS of the interfacial water molecules adsorbed at silver (Ag) electrode even at the electrolytic concentration as low as 0.1 M when ethanol was mixed with water in the ratio of four to one by volume.
SERS intensities of both the O-H stretching band on water molecules and $Ag^\circ-Cl^-$ SERS band were increased by a factor of about two when ethanol was added to form a SERS solution of 0.71M KCl-ethanol(1.0)-water(2.8). Two possibilities are speculated for the ethanol effects: hydrogen-bond breaking (and thus enhanced surface adsorption) of wale molecules. and stabilization of a surface adatomic complex such as $Ag^\circ-Cl^-$.
