TY - JOUR
T1 - Confinement Effect of Photogenerated Soliton-Antisoliton Pair on the Ultrafast Relaxation in a Substituted Polyacetylene
AU - Takeuchi, Satoshi
AU - Yoshizawa, Masayuki
AU - Masuda, Toshio
AU - Higashimura, Toshinobu
AU - Kobayashi, Takayoshi
N1 - Funding Information:
Manuscript received February 18, 1992; revised May 18, 1992. This work was supported in part by the Kurata Science Foundation and the Science Foundation of Du Pont Japan Limited. S. Takeuchi, M. Yoshizawa, and T. Kobayashi are with the Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan. T. Masuda and T. Higashimura are with the Department of Polymer Chemistry, University of Kyoto, Sakyou-ku, Kyoto 606, Japan. IEEE Log Number 9202053.
PY - 1992
Y1 - 1992
N2 - 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±.
AB - 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±.
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U2 - 10.1109/3.159557
DO - 10.1109/3.159557
M3 - Article
AN - SCOPUS:0026941346
VL - 28
SP - 2508
EP - 2517
JO - IEEE Journal of Quantum Electronics
JF - IEEE Journal of Quantum Electronics
SN - 0018-9197
IS - 10
ER -