Raman Spectroscopic Studies of Methane-Ethane Mixtures as a Function of Pressure

Susanne Brunsgaard Hansen, Rolf W. Berg, Erling Halfdan Stenby

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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 MPaA (MPa absolute). For these mixtures methane nu (1) (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 nu (1) band position of ethane-containing mixtures clearly depend on the kind of molecules surrounding the vibrating methane molecule. The nu (1) band position decreases with increasing pressure; the stronger the dependency, the higher the content of ethane. The ethane nu (1) 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.
Original languageEnglish
JournalApplied Spectroscopy
Issue number6
Pages (from-to)745-749
Publication statusPublished - 2001


  • Raman spectroscopy
  • High pressure
  • Methane
  • Methane-ethane mixtures
  • Van der Waals interaction

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