Fig. 3. Zoomed-in Raman spectra of 0.9 mol L⁻¹ solutions at ambient density and 380 K.

Calculated spectra of the sodium carbonate and deuterated sodium bicarbonate solutions are shown in the upper and lower panels, respectively. The isotropic Raman spectra (red line), the intra-molecular Raman spectra (brown line), and the vibrational density of states (VDOS) (blue line) of CO${}_3^{2-}$ are compared.