Raman spectrum of liquid water and Luck's two state model

On the basis of the two state model proposed by Luck it is suggested that the Raman spectrum for water can be explained on the basis of the presence of free and hydrogen bonded O---H bonds. The stretching force constants in the associated species present in liquid water are found to be in general agreement with the observed bands due to free and hydrogen bonded O---H stretching modes in the first overtone IR and the fundamental raman spectra