The dynamics of the ring-closure reaction of poly-1,2-bis(2-methylthien-3-yl)perfluorocyclopentene in chloroform solution is investigated. Ultrafast transient absorption spectra are measured using 260 nm pump pulses. It is shown that the optical switching occurs on a sub-200 fs timescale. The presence of a transient band around 450 nm, which disappears in ∼200 ps, is ascribed to excited-state absorption of the dithiophene moiety.
Ultrafast photoinduced ring-closure dynamics of a diarylethene polymer
BERTARELLI, CHIARA;GALLAZZI, MARIA CARMELA;ZERBI, GIUSEPPE;STAGIRA, SALVATORE;NISOLI, MAURO;DE SILVESTRI, SANDRO
2002-01-01
Abstract
The dynamics of the ring-closure reaction of poly-1,2-bis(2-methylthien-3-yl)perfluorocyclopentene in chloroform solution is investigated. Ultrafast transient absorption spectra are measured using 260 nm pump pulses. It is shown that the optical switching occurs on a sub-200 fs timescale. The presence of a transient band around 450 nm, which disappears in ∼200 ps, is ascribed to excited-state absorption of the dithiophene moiety.File in questo prodotto:
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