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.
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