Abstract
Xylitol is one of the widely used sugar substitutes in food and drug industries. Exploring behavior of xylitol molecules under low- and high-temperature conditions is conducive to predicting the changes in applications. Herein, the low- and high- temperature Raman spectra of xylitol were investigated in the 83 to 363 K temperature interval. The conformation transition of xylitol was firstly observed at 253 K. Besides, the Fermi resonance between two fundamental vibration modes (the symmetric vibration of the CH2 and the antisymmetric vibration of the CH2) was identified for the first time at 308 K. Two-dimensional correlation Raman spectroscopy was used to reveal the Fermi doublets dynamics in the temperature field, and analyze the specific sequence of spectra intensity changes.
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