High-pressure Raman studies of a nitrogen-helium mixture up to 40 GPa

H. Olijnyk, A. P. Jephcoat

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6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)11219-11226
Number of pages8
JournalJournal of Physics Condensed Matter
Volume9
Issue number50
DOIs
Publication statusPublished - Dec 15 1997

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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