Abstract
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.
Highlights
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Plane-polarized radiation of the single-mode continuous-wave laser (Cnilaser, Changchun, China) with a wavelength of 532 nm was directed into the gas cell and excited spontaneous Raman scattering in the medium
The polarized spectrum is the high-intensity peak formed by closely spaced rotational-vibrational lines of the Q branch of the ν1 band
Summary
Band of Pure CH4 and Perturbed by. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
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