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Raman and infrared (IR) spectra were recorded for crystalline cytidine samples at 298, 160, 75 and 10 K. Data were taken over the spectral range 20–4000 cm −1 . The wavenumbers of most vibrational modes were found to increase as the temperature was lowered, but several peaks near 3000 cm −1 showed the opposite trend. A number of peaks split into multiplets at low temperature. No evidence was found of any structural phase transitions in this temperature range. Plausible assignments of all main observed features are suggested.
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Lee et al. (2001) studied this question.
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