The Application of Laser Raman Spectroscopy to Obtaining Internal Pressure of Fluid Inclusions
激光拉曼光谱技术在获取流体包裹体内压中的应用及讨论

The relationship between the Raman shift and the pressure of CO_2, CH_4, N_2, and their mixtures is described in this paper. The fitting of the experimental data shows that all Raman shifts decrease by one order exponential with increasing pressure, no matter the material is pure gas or mixtures. The pressure exerts a much more effect on Raman shifts than the content. Raman shifts of N_2 become more sensitive to pressure because of mixing with methane. However, things are just opposite for methane. Such a phenomenon can be explained by molecular interaction. Peak area, peak width, and peak height all change with increasing pressure. The practical applications indicate that the laser Raman spectroscopy is a new means for obtaining the internal pressure of fluid inclusions with complex systems.