Tanichev Aleksandr S, Petrov Dmitry V
Laboratory of Ecological Instrumentation, Institute of Monitoring of Climatic and Ecological Systems, Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, Russia.
Department of Optics and Spectroscopy, Tomsk State University, 634050 Tomsk, Russia.
Molecules. 2021 Dec 27;27(1):144. doi: 10.3390/molecules27010144.
In this work, the effect of nitrogen and carbon dioxide on the depolarization ratio of the ν band of methane in the pressure range of 0.1-5 MPa is studied. A high-sensitivity single-pass Raman spectrometer was used to obtain accurate results. Moreover, we took into account the overlap of the ν band by the ν and ν + ν bands using the simulation of their spectra. The depolarization ratio of the ν band in pure methane is within 0-0.001, and the effect of nitrogen and carbon dioxide on this parameter is negligible in the indicated pressure range. The obtained results are useful for correct simulation of the Raman spectrum of methane at different pressures, which is necessary to improve the accuracy of gas analysis methods using Raman spectroscopy.
在本工作中，研究了氮气和二氧化碳在0.1 - 5MPa压力范围内对甲烷ν带退偏比的影响。使用高灵敏度单通道拉曼光谱仪以获得准确结果。此外，通过对ν带和ν + ν带光谱的模拟，考虑了它们对ν带的重叠影响。纯甲烷中ν带的退偏比在0 - 0.001范围内，在所示压力范围内，氮气和二氧化碳对该参数的影响可忽略不计。所得结果对于在不同压力下正确模拟甲烷的拉曼光谱很有用，这对于提高使用拉曼光谱的气体分析方法的准确性是必要的。
