Nanosecond Time-Resolved Photoinduced Absorption of trans-Polyacetylene

Masayuki Yoshizawa, Takayoshi Kobayashi, Hitoshi Fujimoto, Jiro Tanaka

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)768-780
Number of pages13
Journaljournal of the physical society of japan
Volume56
Issue number2
DOIs
Publication statusPublished - 1987 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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