1999/11/15 by Federico A. Gorelli, Lorenzo Ulivi, Mario Santoro +1 · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · Materials Science · #High-pressure geophysics and materials #Advanced Chemical Physics Studies #Solid-state spectroscopy and crystallography
paper · doi:10.1103/physrevlett.83.4093
openalex publication_date 1999/11/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
We report a detailed experimental characterization of the infrared absorption properties of the high pressure, red phase of oxygen. Spectra are measured in the far infrared, down to 100cm^\ensuremath-1, in the fundamental vibration and in the overtone regions up to 63 GPa. A new, strong peak is observed at about 300cm^\ensuremath-1. Samples less than 0.5 \ensuremathμm thick were produced to measure the strong vibron mode avoiding saturation. We find that the diatomic oxygen molecule is not a good basis to describe the vibrational spectrum of the \ensuremathε phase. The spectra can be interpreted in a straightforward way on the basis of an association among the oxygen molecules leading to the formation of O4 units.