Journal
MOLECULES
Volume 27, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/molecules27010144
Keywords
Raman spectroscopy; depolarization ratio; nu(1) band; methane; nitrogen; carbon dioxide
Funding
- Russian Science Foundation (RSF) [19-77-10046]
- Russian Science Foundation [19-77-10046] Funding Source: Russian Science Foundation
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This study investigates the effect of nitrogen and carbon dioxide on the depolarization ratio of the nu(1) band of methane. The results indicate that the influence of nitrogen and carbon dioxide on this parameter is negligible within the specified pressure range. These findings are important for improving the accuracy of gas analysis methods using Raman spectroscopy.
In this work, the effect of nitrogen and carbon dioxide on the depolarization ratio of the nu(1) 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 nu(1) band by the nu(3) and nu(2) + nu(4) bands using the simulation of their spectra. The depolarization ratio of the nu(1) 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.
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