Abstract
The photoinduced absorption and bleaching of trans -polyacetylene were investigated in nanosecond time regime for the first time. 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 saturates at ΔA/A O ∼ 0.01. The decay curves of transient absorbance change can be fitted to erf[( t/τ) − 1 2 ] . The time constants are 144±15 ns ((CH) x) and 305±27 ns ((CD) x) at 4 K and 32±6 ns ((CH) x) and 40±6 ns ((CD) x) at 290 K. When the trans content in cis -rich film decreases, the time constant becomes longer. The decay kinetics was interpreted by the interchain recombination of photoexcited polaron pairs.
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