The Raman spectra of ice (Ih, II, III, V, VI and IX) as functions of pressure and temperature

The Raman spectra of various forms of ice I h , II, III, IX, V and VI of H 2 O, D 2 O, H 2 18 O and small percentages of HOD in both D 2 O and H 2 O have been recorded in their true regions of stability. The high-pressure low-temperature Raman cell used for this work is described. The influence of pressure on the OH and OD stretching modes and the lattice vibrational frequencies is discussed. It is estimated that the pressure compresses the O-O bond lengths on average about 5 pm GPa -1 in the I h , II, III and V types of ice. An attempt is made to correlate the available spectroscopic and crystallographic data for the various forms of ice in order to make assignments of the Raman- and infrared-active lattice vibrational spectra.