The temperature dependence of Raman spectra of H2O at 50 GPa. Pressure was measured at room temperature. The Raman spectra are normalized using a white light source of known spectral distribution. The Raman signal corresponding to the second-order scattering from the diamond anvils is subtracted [94]. The shaded area masks a numerical artifact due to this procedure in the vicinity of the diamond second-order peak. The rectangle centered near 1332 cm−1 masks differential peculiarities associated with the subtraction of the diamond first-order peak. Arrows show the tendencies in temperature dependencies of the O-H stretch components.
