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Depolarization Ratio of the ν1 Raman Band of Pure CH4 and Perturbed by N2 and CO2

1
Laboratory of Ecological Instrumentation, Institute of Monitoring of Climatic and Ecological Systems, Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, Russia
2
Department of Optics and Spectroscopy, Tomsk State University, 634050 Tomsk, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Andrzej Grzechnik
Molecules 2022, 27(1), 144; https://doi.org/10.3390/molecules27010144
Received: 9 December 2021 / Revised: 22 December 2021 / Accepted: 24 December 2021 / Published: 27 December 2021
(This article belongs to the Section Physical Chemistry)
In this work, the effect of nitrogen and carbon dioxide on the depolarization ratio of the ν1 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 ν1 band by the ν3 and ν2 + ν4 bands using the simulation of their spectra. The depolarization ratio of the ν1 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. View Full-Text
Keywords: Raman spectroscopy; depolarization ratio; ν1 band; methane; nitrogen; carbon dioxide Raman spectroscopy; depolarization ratio; ν1 band; methane; nitrogen; carbon dioxide
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MDPI and ACS Style

Tanichev, A.S.; Petrov, D.V. Depolarization Ratio of the ν1 Raman Band of Pure CH4 and Perturbed by N2 and CO2. Molecules 2022, 27, 144. https://doi.org/10.3390/molecules27010144

AMA Style

Tanichev AS, Petrov DV. Depolarization Ratio of the ν1 Raman Band of Pure CH4 and Perturbed by N2 and CO2. Molecules. 2022; 27(1):144. https://doi.org/10.3390/molecules27010144

Chicago/Turabian Style

Tanichev, Aleksandr S., and Dmitry V. Petrov. 2022. "Depolarization Ratio of the ν1 Raman Band of Pure CH4 and Perturbed by N2 and CO2" Molecules 27, no. 1: 144. https://doi.org/10.3390/molecules27010144

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