Nanosecond Time-Resolved Photoinduced Absorption of trans-Polyacetylene

Masayuki Yoshizawa; Takayoshi Kobayashi; Hitoshi Fujimoto; Jiro Tanaka

doi:10.1143/JPSJ.56.768

Nanosecond Time-Resolved Photoinduced Absorption of trans-Polyacetylene

Masayuki Yoshizawa, Takayoshi Kobayashi, Hitoshi Fujimoto, Jiro Tanaka

Research output: Contribution to journal › Article

28 Citations (Scopus)

Abstract

The photoinduced absorption and bleaching of trans-(CH)^x and trans-(CD)^x in the nanosecond time region were investigated for the first time by time-resolved absorption spectroscopy. The transient absorption near the band gap and the bleaching of the interband transition were observed for both trans-(CH)^x and trans-(CD)^x. The absorption near the band gap saturated at ΔA/A⁰~0.01. The decay of transient absorption at 4K was fitted to erf [(t/τ)^-1/2] with τ=144±15ns for trans-(CH)_x and τ=305±27 ns for trans-(CD)^x. When the temperature is increased, the decay kinetics are given by the same function with shorter time constants, τ=32±6 ns for trans-(CH)_x and τ=40±6 ns for trans-(CD)_x at 290 K. When the trans content in cis-rich film decreased, the time constant became longer. The decay kinetics is interpreted by interchain recombination of photoinduced polaron pairs.

Original language	English
Pages (from-to)	768-780
Number of pages	13
Journal	journal of the physical society of japan
Volume	56
Issue number	2
DOIs	https://doi.org/10.1143/JPSJ.56.768
Publication status	Published - 1987 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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Yoshizawa, M., Kobayashi, T., Fujimoto, H., & Tanaka, J. (1987). Nanosecond Time-Resolved Photoinduced Absorption of trans-Polyacetylene. journal of the physical society of japan, 56(2), 768-780. https://doi.org/10.1143/JPSJ.56.768

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title = "Nanosecond Time-Resolved Photoinduced Absorption of trans-Polyacetylene",

abstract = "The photoinduced absorption and bleaching of trans-(CH)x and trans-(CD)x in the nanosecond time region were investigated for the first time by time-resolved absorption spectroscopy. The transient absorption near the band gap and the bleaching of the interband transition were observed for both trans-(CH)x and trans-(CD)x. The absorption near the band gap saturated at ΔA/A0~0.01. The decay of transient absorption at 4K was fitted to erf [(t/τ)-1/2] with τ=144±15ns for trans-(CH)x and τ=305±27 ns for trans-(CD)x. When the temperature is increased, the decay kinetics are given by the same function with shorter time constants, τ=32±6 ns for trans-(CH)x and τ=40±6 ns for trans-(CD)x at 290 K. When the trans content in cis-rich film decreased, the time constant became longer. The decay kinetics is interpreted by interchain recombination of photoinduced polaron pairs.",

author = "Masayuki Yoshizawa and Takayoshi Kobayashi and Hitoshi Fujimoto and Jiro Tanaka",

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AU - Yoshizawa, Masayuki

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N2 - The photoinduced absorption and bleaching of trans-(CH)x and trans-(CD)x in the nanosecond time region were investigated for the first time by time-resolved absorption spectroscopy. The transient absorption near the band gap and the bleaching of the interband transition were observed for both trans-(CH)x and trans-(CD)x. The absorption near the band gap saturated at ΔA/A0~0.01. The decay of transient absorption at 4K was fitted to erf [(t/τ)-1/2] with τ=144±15ns for trans-(CH)x and τ=305±27 ns for trans-(CD)x. When the temperature is increased, the decay kinetics are given by the same function with shorter time constants, τ=32±6 ns for trans-(CH)x and τ=40±6 ns for trans-(CD)x at 290 K. When the trans content in cis-rich film decreased, the time constant became longer. The decay kinetics is interpreted by interchain recombination of photoinduced polaron pairs.

AB - The photoinduced absorption and bleaching of trans-(CH)x and trans-(CD)x in the nanosecond time region were investigated for the first time by time-resolved absorption spectroscopy. The transient absorption near the band gap and the bleaching of the interband transition were observed for both trans-(CH)x and trans-(CD)x. The absorption near the band gap saturated at ΔA/A0~0.01. The decay of transient absorption at 4K was fitted to erf [(t/τ)-1/2] with τ=144±15ns for trans-(CH)x and τ=305±27 ns for trans-(CD)x. When the temperature is increased, the decay kinetics are given by the same function with shorter time constants, τ=32±6 ns for trans-(CH)x and τ=40±6 ns for trans-(CD)x at 290 K. When the trans content in cis-rich film decreased, the time constant became longer. The decay kinetics is interpreted by interchain recombination of photoinduced polaron pairs.

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