Abstract
Raman-scattering experiments on crystalline pyrene have been used to determine lattice frequencies as a function of pressure up to 10 kbar and of temperature down to 10 K. The solid state transition from the normal dimer-structure form (pyrene I) to the unknown high-density form (pyrene II) is dramatically manifested as an abrupt transformation in the phonon spectrum: I ↔ II occurs at (300 K, 4.0 kbar) and at (110 K, 0 kbar). Besides providing the first observation of external modes in both pyrene I and II, these experiments constitute the first observation of the transition at high pressure.
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