The ε Phase of Solid Oxygen: Evidence of an O4 Molecule Lattice

Federico A. Gorelli, Lorenzo Ulivi, Mario Santoro, and Roberto Bini
Phys. Rev. Lett. 83, 4093 – Published 15 November 1999
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Abstract

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 100cm1, in the fundamental vibration and in the overtone regions up to 63 GPa. A new, strong peak is observed at about 300cm1. Samples less than 0.5 μm 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 ε 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.

  • Received 2 July 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.4093

©1999 American Physical Society

Authors & Affiliations

Federico A. Gorelli1,3,*, Lorenzo Ulivi2,†, Mario Santoro1,3,‡, and Roberto Bini3,4,§

  • 1Dipartimento di Fisica dell'Università di Firenze and INFM, Largo E. Fermi 2, I-50125 Firenze, Italy
  • 2Istituto di Elettronica Quantistica, Consiglio Nazionale delle Ricerche, and INFM Via Panciatichi 56/30, I-50127 Firenze, Italy
  • 3LENS, European Laboratory for Non-linear Spectroscopy, Largo E. Fermi 2, I-50125 Firenze, Italy
  • 4Dipartimento di Chimica dell'Università di Firenze, Via G. Capponi 9, I-50121 Firenze, Italy

  • *Electronic address: gorelli@lens.unifi.it
  • Electronic address: ulivi@ieq.fi.cnr.it
  • Electronic address: santoro@lens.unifi.it
  • §Electronic address: bini@chim.unifi.it

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Issue

Vol. 83, Iss. 20 — 15 November 1999

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