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Schmidhammer, Uli; Waele, Vincent de; Buntinx, G. and Riedle, Eberhard ORCID logoORCID: https://orcid.org/0000-0002-2672-5718 (2005): From ultrafast spectroscopy to bidirectional molecular switches: DHA/VHF. Ultrafast Phenomena XIV, Niigata, Japan, July 25–30, 2004. Kobayashi, Takayoshi; Okada, Tadashi; Kobayashi, Tetsuro; Nelson, Keith A. and Silvestri, Sandro de (eds.) : In: Ultrafast Phenomena. XIV Proceedings of the 14th International Conference, Niigata, Japan, July 25–30, 2004, Vol. 79 Berlin; Heidelberg: Springer. pp. 465-467

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The photoconversion from dihydroazulene (DHA) to vinylheptafulvene (VHF) is governed by two mechanisms: The ring opening proceeds on the excited energy surface on PF the picosecond time scale. It is followed by an internal conversion to the VHF ground state that is accelerated by the presence of a conical intersection in the case of cyclopenta-DHA. This conical intersection hinders the photoinduced back reaction from the final WIT products. However, we successfully photoconverted the cyanophenyl-VHF-cis back to the DHA with a second delayed pulse. This opens the route to the development of bistable DHAs.

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