Raman spectra of methane and methane–ethane mixtures (100, 85, and 49 mole % CH₄) have been obtained as a function of pressure in the pressure range 0.1 to 15.3 MPa_A (MPa absolute). For these mixtures methane υ₁ (symmetric C–H stretching) band positions are given as a function of pressure; for pure methane they are in agreement with previous results. The new data on the methane υ₁ band position of ethane-containing mixtures clearly depend on the kind of molecules surrounding the vibrating methane molecule. The υ₁ band position decreases with increasing pressure; the stronger the dependency, the higher the content of ethane. The ethane υ₁ band position in the two mixtures showed the same kind of dependency. A qualitative explanation for this behavior is attempted, relating it to changes in van der Waals-type interactions on pressure.

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