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 mm 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 e 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.
Evidence of the formation of the O4 molecule in solid oxygen under pressure
FA Gorelli;M Santoro;
2000
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 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 mm 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 e 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
