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

H. Olijnyk; A. P. Jephcoat

doi:10.1088/0953-8984/9/50/022

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

H. Olijnyk, A. P. Jephcoat

Research output: Contribution to journal › Article › peer-review

5 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 language	English
Pages (from-to)	11219-11226
Number of pages	8
Journal	Journal of Physics Condensed Matter
Volume	9
Issue number	50
DOIs	https://doi.org/10.1088/0953-8984/9/50/022
Publication status	Published - Dec 15 1997

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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10.1088/0953-8984/9/50/022

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title = "High-pressure Raman studies of a nitrogen-helium mixture up to 40 GPa",

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.",

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T1 - High-pressure Raman studies of a nitrogen-helium mixture up to 40 GPa

AU - Olijnyk, H.

AU - Jephcoat, A. P.

PY - 1997/12/15

Y1 - 1997/12/15

N2 - 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.

AB - 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.

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JO - Journal of Physics Condensed Matter

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ER -

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

Abstract

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