Abstract
The peak positions and halfwidths of the Q-branch of the ν1 band and the ratios of intensities of the Q-branches of ν3 and 2ν2 bands of methane are measured in a methane–helium mixture at different pressures and concentrations. An empirical model is developed for estimation of the He concentration in a methane-containing medium from measurements of the above parameters. The error in the He concentration is found to be less than 1% when using the ν1 band halfwidth. The paths of improvement of this technique and enhancement of its accuracy are considered.
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The research was funded by RFBR and Tomsk region, project number 19-42-700006.
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Translated by O. Ponomareva
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Tanichev, A.S., Petrov, D.V., Matrosov, I.I. et al. Effect of Helium on the Raman Spectrum of Methane in the 2500–3300 cm−1 Range. Atmos Ocean Opt 34, 395–399 (2021). https://doi.org/10.1134/S1024856021050225
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DOI: https://doi.org/10.1134/S1024856021050225