Top left: Raman spectrum of CO₂ clathrate hydrate at 260 K. Main feature at ~3200 cm^-1 is due to O−H stretch. Boxed regions are expanded in adjacent plots. Top right: close-up of main Raman spectrum in the range 1200−1500 cm^-1, showing ~1280 cm^-1 and ~1390 cm^-1 features. Bottom left: close-up in the range 50−350 cm^-1, showing ~220 cm^-1 feature. Bottom right: close-up in the range 1600−5500 cm^-1, showing ~1753 cm^-1 and ~2341 cm^-1 features. See text for details.