High Pressure Raman Study of Solid CS2.

Solid molecular CS2 is investigated in a diamond anvil cell in the temperature and pressure range of 6–300 K and 0–20 GPa, respectively, by means of Raman spectroscopy. The pressure dependence of external and internal vibrational frequencies is determined, and used to draw conclusions about the p–T phase diagram. A very strong influence of sample preparation conditions on the crystal quality, especially at low temperatures, is noticed. It turned out that the librational Raman spectrum provides a sensitive test with respect to the crystalline or amorphous structure of the solids under investigation. In addition the origin of the ν2 fundamental and phonon sidebands, some‐times observed in spectra of amorphous CS2, will be discussed. Finally the influence of temperature and pressure is shown in the so‐called ‘‘black’’ CS2, a polymerized modification of CS2, which is formed at pressures above 10 GPa.