A He-N2 mixture of 0.8 mole fraction He was investigated by high-pressure Raman spectroscopy. The N2 vibron in fluid He-N2 is observed up to ≈ 9 GPa. Spectra of external and internal modes of the van der Waals compound He(N2)11, which is formed above 9 GPa. were obtained up to 40 GPa. The similarities of the spectral features to those of ε-N2 imply a close relationship between the structures of He(N2)11 and ε-N2. The enhanced v2/v1-intensity ratio suggests that He may substitute or displace N2 molecules from the a site in the ε-phase. The observed splitting of the main vibron of isotopic species 14N-15N indicates that in addition to factor-group interactions site effects are responsible for the observed splittings of the 14N2 main vibron of He(N2)11.
|Number of pages||8|
|Journal||Journal of Physics Condensed Matter|
|Publication status||Published - Dec 15 1997|
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics