NDLI: Phonon dispersion of the external and low-frequency internal vibrations in monoclinic tetracyanoethylene at 5K

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Phonon dispersion of the external and low-frequency internal vibrations in monoclinic tetracyanoethylene at 5K

Content Provider	Scilit
Author	Chaplot, S. L. Mierzejewski, A. Pawley, G. S. Lefebvre, J. Luty, T.
Copyright Year	1983
Description	Journal: Journal of Physics C: Solid State Physics Phonon dispersion relations have been determined using neutron coherent inelastic scattering in the monoclinic phase of tetracyanoethylene supercooled to 5K, for 24 low-frequency branches comprising 12 external and 12 internal vibrations along the symmetry directions a, b and c*. Theoretical predictions have been made using an extension of the external mode formalism in which only the seven low-frequency internal vibrations (one just out of experimental range) of the free molecule are considered along with the external vibrations. The various experimental results from neutron, Raman and infrared spectroscopy agree satisfactorily with the theoretical predictions. Appreciable dispersion and Davydov splitting are found for the 'internal' phonons and the eigenvectors in general contain both internal and external character. Model improvements are thought to be possible only by the introduction of Coulomb interactions between these highly polarisable molecules. The dispersion curves show no evidence of phonon instability which may be related to the solid state phase transition.
Related Links	http://iopscience.iop.org/article/10.1088/0022-3719/16/4/010/pdf
Ending Page	644
Page Count	20
Starting Page	625
ISSN	00223719
DOI	10.1088/0022-3719/16/4/010
Journal	Journal of Physics C: Solid State Physics
Issue Number	4
Volume Number	16
Language	English
Publisher	IOP Publishing
Publisher Date	1983-02-10
Access Restriction	Open
Subject Keyword	Journal: Journal of Physics C: Solid State Physics Atomic, Molecular and Chemical Physics Dispersion Relation Infrared Spectroscopy Inelastic Scattering
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Condensed Matter Physics Engineering

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