Solid Oxygen at High Pressure and Low Temperature: Raman Observation of Librons and Vibron

Abstract
This paper reports the results of an experimental high-pressure study of solid oxygen at low temperature up to 60 kbar. Librons and vibron were observed with Raman light scattering. Evidence is presented for a low-temperature phase transition at about 9 kbar. Very recently a phase transition was predicted in this temperature and pressure regime. However, the overall agreement with theory is modest.