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Phonon Dispersion in an α‐Perylene d 12 ‐Crystal at 10 K
Author(s) -
Schleifer J.,
Kalus J.,
Schmelzer U.,
Eckold G.
Publication year - 1989
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221540114
Subject(s) - phonon , dispersion (optics) , perylene , inelastic neutron scattering , raman scattering , raman spectroscopy , coupling (piping) , physics , molecular physics , scattering , condensed matter physics , inelastic scattering , neutron scattering , molecular vibration , materials science , molecule , optics , quantum mechanics , metallurgy
Phonon dispersion curves for the 24 external and some of the internal modes in α‐perylene‐d 12 (C 20 D 12 ) are measured at 10 K for the [ζ00], [0ζ0], and [00ζ] directions by coherent inelastic neutron scattering and Raman scattering. Calculations are performed with a semi‐rigid‐molecule‐model, based on well‐known 6‐exp‐potential functions. The agreement between measurements and calculations is satisfactory. Because of strong mode coupling the identification of the character of the closely neighbouring phonons is often not unique.