Confinement Effect of Photogenerated Soliton-Antisoliton Pair on the Ultrafast Relaxation in a Substituted Polyacetylene

Satoshi Takeuchi, Masayuki Yoshizawa, Toshio Masuda, Toshinobu Higashimura, Takayoshi Kobayashi

研究成果: Article査読

31 被引用数 (Scopus)

抄録

Femtosecond pump-probe experiments have been performed on poly[o-(trimethylsilyl)phenylacetylene] thin films to investigate the effect of confinement of a photogenerated soliton-antisoliton pair on its ultrafast relaxation dynamics. the decay kinetics of transient photoinduced absortion due to the photoexcitations of the polymer were found to behave as erf (t-n) with n = 0.65 ± 0.05, implying a geminate recombination process of the soliton-antisoliton pair on a quasi-one-dimensional chain. the distance between the soliton and antisoliton could be estimated as about six repeat unit lengths, suggesting a fairly strong confinement of the pair. It is consistent with the size of a certain regular structure indicated to exist in this material by X-ray diffraction measurements. Creation of confined pairs of likely charged solitons due to interchain photoexcitation is also discussed in terms of the following energetically favored reaction between likely charged polarons on the same chain: P± + P± → S± + S±.

本文言語English
ページ(範囲)2508-2517
ページ数10
ジャーナルIEEE Journal of Quantum Electronics
28
10
DOI
出版ステータスPublished - 1992
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 凝縮系物理学
  • 電子工学および電気工学

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