Polarized vibrational density of states of polyacetylene from incoherent inelastic neutron scattering

Journal Article · Sat Jun 15 00:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.14305· OSTI ID:5487870

Sauvajol, J L ^[1]; Djurado, D ^[2]; Dianoux, A ^[3]; Theophilou, N; Fischer, J E ^[4]

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1. Groupe de Dynamique des Phases Condensees, Universite Montpellier II, 34095 Montpellier CEDEX, France (FR)
2. Laboratoire de Chimie des Solides, Universite Blaise Pascal, 63177 Ambiere CEDEX, France (FR)
3. Institut Laue-Langevin, 156X, 38042 Grenoble CEDEX, France (FR)
4. Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (USA)

We establish the feasibility of obtaining polarization and energy information about the lattice modes of conjugated polymers, based on an analysis of incoherent inelastic neutron scattering spectra from stretch-oriented {ital cis}-rich polyacetylene films. With two different scattering geometries and by summing over different scattering angles, we determine separately the collective dynamics parallel and perpendicular to the average chain axis. A feature at 2.9 meV in the {bold Q}{parallel}{ital c} geometry is assigned to the relative longitudinal motion of the two inequivalent chains/cell.

• DOE Contract Number: FG02-86ER45254
• OSTI ID: 5487870
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 43:17; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
POLYACETYLENES
VIBRATIONAL STATES
COLLECTIVE EXCITATIONS
ENERGY-LEVEL DENSITY
FILMS
NEUTRON DIFFRACTION
POLARIZATION
COHERENT SCATTERING
DIFFRACTION
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
HYDROCARBONS
ORGANIC COMPOUNDS
POLYENES
SCATTERING
360603* - Materials- Properties