Abstract
High-pressure Raman scattering experiments of O 2 and N 2 were carried out at 296 K and at pressures up to 10 and 6 GPa, respectively, and the pressure dependence of vibrational spectra of O 2 was studied on the basis of molecular interactions in comparison with N 2. An appreciable contribution of the attractive interaction to the vibrational frequency was observed for fluid O 2. The linewidth of the spectra for fluid O 2 showed a sharp increase with increasing pressure, and the fluid–solid transition was observed at 5.9 GPa with a sudden drop of the linewidth.
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