期刊
CHEMICAL PHYSICS LETTERS
卷 375, 期 5-6, 页码 490-494出版社
ELSEVIER
DOI: 10.1016/S0009-2614(03)00931-X
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We have recently studied two solid phases of bulk pentacene (polymorphs H and Q by means of lattice phonon Raman spectroscopy. The assignment, previously based on lattice dynamics calculations alone, is now verified by X-ray diffraction measurements, conclusively confirming the existence of both polymorphs. Furthermore, Raman phonon spectra indicate a pressure-induced phase transition where the polymorph C (lower density phase) transforms to the H form (higher density phase). The onset pressure for the phase transition is only 0.2 GPa. The phase change is irreversible. (C) 2003 Elsevier Science B.V. All rights reserved.
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