Vol. 34, issue 05, article # 3

Tanichev A. S., Petrov D. V., Matrosov I. I., Sharybkina K. K. Effect of helium on the Raman spectrum of methane in the range 2500–3300 cm-1. // Optika Atmosfery i Okeana. 2021. V. 34. No. 05. P. 329–333. DOI: 10.15372/AOO20210503 [in Russian].
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The peak positions and half-widths of the Q-branch of the ν1 band, as well as the ratios of intensities of the Q-branches of ν3 and 2ν2 bands of methane in a methane–helium mixture are measured at various pressures and concentrations. An empirical model has been developed for estimation of the helium concentration in a methane-bearing medium by measuring these spectral parameters. The error in the He concentration is found to be less than 1% when using the ν1 band half-width. The ways of developing this technique and increasing its accuracy are considered.


methane, helium, Raman spectroscopy, gas analysis


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