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Phys. Rev. Lett. 83, 4093–4096 (1999)

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

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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

Received 2 July 1999; published in the issue dated 15 November 1999

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 100 cm-1, in the fundamental vibration and in the overtone regions up to 63 GPa. A new, strong peak is observed at about 300 cm-1. 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.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.4093
DOI:
10.1103/PhysRevLett.83.4093
PACS:
62.50.+p, 63.20.Dj, 78.30.-j

*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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