Band Edge and Neutral Soliton Absorption in Polyacetylene: The Role of Coulomb Correlation

1 February 1985

journal article
research article
Published by Taylor & Francis in Molecular Crystals and Liquid Crystals

Vol. 117 (1) , 275-282
https://doi.org/10.1080/00268948508074636

Abstract

The technique of Photothermal Deflection Spectroscopy (PDS) has provided the clearest measurement of the absorption edge in polyacetylene. Compensated trans-(CH)_x has an Urbach edge which covers orders of magnitude change in absorption in the range 0.9-1.7 eV. Parallel measurements of PDS and spin resonance on compensated trans-(CH)_x fails to reveal the predicted neutral soliton (S^o) absorption near midgap. The S^o absorption has been measured in a Photoinduced Absorption (PA) experiment in which the PA spectrum is dominated by a change in the number of S^o centers. These results provide new insight into such fundamental issues as the importance of Coulomb correlations and the role of disorder in polyacetylene.

Keywords

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