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The solid state transition in pyrene

โœ Scribed by R. Zallen; C.H. Griffiths; M.L. Slade; M. Hayek; O. Brafman

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
417 KB
Volume
39
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

Raman

-scattering experiments on crystalline pyrene have been used to determine lattice frequencies as a functio? 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 hi&-density form (pyrene IL) 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 kbsr). Besides providing the first observation of external modes in both pyiene I and II, these experiments constitute the fust observation of the transition at high pressure.

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