等容条件下H2O-CO2-CH4混合流体的高温拉曼光谱就位分析

 以合成包裹体作为腔体，用显微激光拉曼探针就位分析了H₂O-CO₂-CH₄混合流体的高温特性。研究结果表明，在高温下，CH₄和CO₂相互之间对各自拉曼光谱的影响不大，水分子对它们的拉曼峰有比较大的影响。在等容条件下，流体均一前，随着温度的升高，水分子的氢键几乎呈线性减少，均一为气相的流体，水分子伸缩振动拉曼峰的变化与一般气体变化相似；随着温度升高，体系压力的增加，最大峰频率呈很微小的降低趋势。均一为液相的流体中的水分子，在均一温度时，氢键变化发生了转折，均一后流体中水分子的氢键受温度的影响比均一前明显要小，在测量的最高温度520 ℃，水分子存在着一定的氢键作用。一直到拉曼光谱测量的最高温度580 ℃还未均一的流体，液相中水分子存在比较强的氢键作用。

An in-Situ Raman Spectroscopy Study of Isochoric H2O-CO2-CH4 Fluids under High Temperature

The characteristics of the H₂O-CO₂-CH₄ fluid at high temperature were studied by Raman spectroscopy. The results show that the Raman spectra of CH₄ and CO₂ do not influence each other, but they are both affected by H₂O at high temperature. The hydrogen bonding of water decreases linearly before it becomes homogenous under isochoric condition. As the fluid becomes a homogenous gas, the Raman spectroscopy has little change with temperature. The hydrogen bonding of water, however, still remains in the homogenous liquid, even at the highest temperature of 520 ℃ in experiment. For the homogenous fluid at the highest temperature of 580 ℃ during measurement, the hydrogen bonding of liquid water remains relatively stronger.