Derivative analysis of Raman spectra of liquid water in the O---H(D) stretching region

Abstract

Second derivative analysis of Raman spectra of H₂O, D₂O and HOD in liquid phase at room temperature for parallel and perpendicular polarized modes in the O---H and O---D stretching regions is reported. Five components obtained at approximately 3215, 3375, 3455, 3535 and 3640 cm^-1 for the second derivative plots of raman spectra of liquid water are explained as due to the presence of three types of associated water species with (i) both O---H bonds involved in moderately strong hydrogen bonds (SS), (ii) both O---H bonds involved in weak hydrogen bonds (WW), and (iii) one O---H bond involved in strong and one in weak hydrogen bonds (SW) respectively. The derivative plots obtained for raman spectra of D₂O and HOD also contain features expected to be present on the basis of this model.