Lattice relaxation in linear polyenes

Z. Shuai, J. L. Brédas

Research output: Contribution to journalArticlepeer-review


We present a multi-phonon approach to analyze the lattice relaxation in thefirst Bu excited state of linear polyenes, from trans-butadiene to polyacetylene. Photo-absorption experiments carried out on a series of linear polyenes, β-carotene, polyenals/polyenones, and polyacetylene are discussed. The Huang-Rhys factor S and the relaxation energy are calculated for polyenes with various lengths. A major result is that we find that the S value first tends to decrease with increasing chain length but after some critical length the evolution completely modifies and S starts increasing. We therefore caution that extrapolations based on observations on short polyenes might be invalid for the polymer.

Original languageEnglish (US)
Pages (from-to)4479-4484
Number of pages6
JournalSynthetic Metals
Issue number2-3
StatePublished - Apr 19 1993
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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