Institute of Monitoring of Climatic and Ecological Systems, Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, Russia.
Tomsk State University, 634050 Tomsk, Russia.
Molecules. 2020 Apr 22;25(8):1951. doi: 10.3390/molecules25081951.
In this work, we measured the intensities of Q-branches of the ν, ν and ν bands in the polarized and depolarized methane Raman spectra in the pressure range of 1-60 atm. It was established that the pressure dependence of depolarization ratios of the ν and ν bands are negligible. In turn, the depolarization ratio of the ν band increases with increasing pressure and reaches approximately 0.0045 at 60 atm. These data are more precise than previously published ones because ν band intensities were determined taking into account the contribution of overlapping lines of ν band. The presented data will be useful in calculating the methane polarizabilities at high pressure, as well as in calculating methane Raman spectra for measuring the natural gas composition using Raman spectroscopy.
在这项工作中，我们测量了在 1-60 大气压范围内极化和非极化甲烷拉曼光谱中 ν、ν 和 ν 带 Q 支的强度。结果表明，ν 和 ν 带的退偏振比随压力的变化可以忽略不计。而 ν 带的退偏振比随压力的增加而增加，在 60 大气压时达到约 0.0045。这些数据比以前发表的数据更精确，因为 ν 带强度的确定考虑了 ν 带重叠线的贡献。所提供的数据将有助于计算高压下甲烷的极化率，以及计算甲烷拉曼光谱，以使用拉曼光谱法测量天然气的组成。
