Raman spectra of methane and methane–ethane mixtures (100, 85, and 49 mole % CH<sub>4</sub>) have been obtained as a function of pressure in the pressure range 0.1 to 15.3 MPa<sub>A</sub> (MPa absolute). For these mixtures methane <i>υ</i><sub>1</sub> (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 <i>υ</i><sub>1</sub> band position of ethane-containing mixtures clearly depend on the kind of molecules surrounding the vibrating methane molecule. The <i>υ</i><sub>1</sub> band position decreases with increasing pressure; the stronger the dependency, the higher the content of ethane. The ethane <i>υ</i><sub>1</sub> 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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