A mixture of 0.8 mole fraction He was investigated by high-pressure Raman spectroscopy. The vibron in fluid is observed up to . Spectra of external and internal modes of the van der Waals compound , which is formed above 9 GPa, were obtained up to 40 GPa. The similarities of the spectral features to those of imply a close relationship between the structures of and . The enhanced -intensity ratio suggests that He may substitute or displace molecules from the a site in the -phase. The observed splitting of the main vibron of isotopic species indicates that in addition to factor-group interactions site effects are responsible for the observed splittings of the main vibron of .
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Olijnyk et al. (1997) studied this question.
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