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

H. Olijnyk, A. P. Jephcoat

Research output: Contribution to journalArticle

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
Externally publishedYes

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Helium
Raman spectroscopy
Nitrogen
helium
nitrogen
Molecules
Fluids
substitutes
fluids
molecules
interactions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

High-pressure Raman studies of a nitrogen-helium mixture up to 40 GPa. / Olijnyk, H.; Jephcoat, A. P.

In: Journal of Physics Condensed Matter, Vol. 9, No. 50, 15.12.1997, p. 11219-11226.

Research output: Contribution to journalArticle

Olijnyk, H. ; Jephcoat, A. P. / High-pressure Raman studies of a nitrogen-helium mixture up to 40 GPa. In: Journal of Physics Condensed Matter. 1997 ; Vol. 9, No. 50. pp. 11219-11226.
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