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利用熔融石英毛细管反应器作为反应器,结合拉曼光谱仪,研究了密闭体系气液共存水的高温(100~350℃)拉曼特性。结果表明:随着温度的升高,液相中水的拉曼信号整体向高频率频移,拟合的强氢键峰(HBS)逐渐减弱,拟合的弱氢键峰(HBW)逐渐增强,两拟合峰的半峰宽(FWHM)均逐渐变窄;气相中水的拉曼信号逐渐增强,拟合的弱氢键峰向低频率频移,半峰宽逐渐变宽。实验揭示了密闭体系水分子气液平衡状态变化,水分子内部结构及作用力变化,为高温气液共存纯水体系水分子拉曼特性变化提供理论依据。
The fused silica capillary reactor was used as the reactor, and the Raman spectroscopy was used to study the high temperature (100 ~ 350 ℃) Raman properties of gas-liquid coexisting water in a closed system. The results show that as the temperature increases, the Raman signal of the water in the liquid phase shifts to a higher frequency, and the fitted strong hydrogen bond peak (HBS) gradually decreases and the fitted weak hydrogen bond peak (HBW) increases gradually (FWHM) of the two fitted peaks are gradually narrowed. The Raman signal of water in the gas phase is gradually enhanced. The fitted weak hydrogen bond peaks shift to low frequency and the FWHM broadens gradually. The experiment reveals the change of gas-liquid equilibrium state and the change of internal structure and force of water molecule in airtight system, and provides a theoretical basis for the Raman character of water molecule in pure water system with high temperature.