The Pinned Mode in Polyacetylene: A Distribution of Soliton Lattice Densities

Abstract

The pinned mode in optically excited polyacetylene is a vibrational envelope with a width of approx. 500 reciprocal centimeters. The width of this mode has been attributed to single solitons interacting with a wide range of pinning parameters. The constancy of the envelope for polyacetylene prepared by disparate methods (Shirakawa and Durham) and cis-trans ratios, cast doubt on this concept as the underlying mechanism for the shape of this vibration. The results of the work discussed here indicate that a more likely cause for the observed envelope is a superposition of spectra of various soliton lattice densities, all pinned with the same pinning mechanism. Polyacetylene, Polythiophene, Defect vibration, Infrared spectroscopy. Reprints.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1989
Accession Number
ADA208987

Entities

People

  • J. C. Hicks
  • Roger D. Boss

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Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Absorption
  • Absorption Coefficients
  • Absorption Spectra
  • Charge Density
  • Classification
  • Coefficients
  • Conductive Polymers
  • Crystal Structure
  • Frequency
  • Infrared Spectroscopy
  • Lasers
  • Military Research
  • Polymers
  • Shape
  • Spectra
  • Spectroscopy
  • Vibration

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  • Materials Science and Engineering.
  • Theoretical Analysis.
  • Wave Propagation and Nonlinear Chaotic Dynamics.