Interpretation of the pressure-induced Raman frequency shift of the ν 1 stretching bands of CH 4 and N 2 within CH4-CO2 , N2-CO2 and CH4-N2 binary mixtures - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2021

Interpretation of the pressure-induced Raman frequency shift of the ν 1 stretching bands of CH 4 and N 2 within CH4-CO2 , N2-CO2 and CH4-N2 binary mixtures

Van-Hoan Le
Alexandre Tarantola
Marie-Camille Caumon

Résumé

The relationships between the frequency shift of the v1 stretching bands of CH4 and N2 with pressure (or density) and composition has been previously provided in the literature as accurate empirical barometers and densimeters for the direct determination of the pressure or density of gas mixtures. However, the latter results still remain a pure description of the experimental data without any interpretation of the physical mechanisms hidden behind the variation trend of the observed peak position. The present paper is devoted to interpreting the origin of the pressure-induced vibrational frequency shifts of the v1 stretching bands of CH4 and N2 within CH4-CO2, N2-CO2 and CH4-N2 binary mixtures at the molecular scale. Two different theoretical models (i.e., the Lennard-Jones 6-12 potential approximation-LJ, and the generalized perturbed hardsphere fluid-PHF) are used to intuitively and qualitatively assess the variation trend as well as the magnitude of the frequency shift of the CH4 and N2 v1 bands for an in-depth understanding. Thereby, the contribution of the attractive and repulsive solvation-mean forces to the variation of the Raman frequency shift as a function of pressure and composition is assessed. A predictive model of the variation trend of the frequency shift of the CH4 v1 band as a function of pressure (up to 3000 bars), density and composition within CH4-N2 and CH4-CO2 binary mixtures is then provided.
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hal-03188338 , version 1 (01-04-2021)

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Van-Hoan Le, Alexandre Tarantola, Marie-Camille Caumon. Interpretation of the pressure-induced Raman frequency shift of the ν 1 stretching bands of CH 4 and N 2 within CH4-CO2 , N2-CO2 and CH4-N2 binary mixtures. Physical Chemistry Chemical Physics, 2021, ⟨10.1039/d1cp00163a⟩. ⟨hal-03188338⟩
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