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- W1979435023 abstract "Geometry of the S0 and S1 states of s-trans butadiene is optimized and the corresponding force fields calculated using a multiconfiguration self-consistent field (MCSCF) method in the complete active space formulation. Three stable conformations of the S1(2Ag) state are shown to be nonplanar (S2, C2, and C1 symmetry), quasidegenerate and separated by a barrier along torsional coordinates of ca. 1600 cm−1. The planar C2h conformation forms a transition state between the S2 and C2 configurations. It is shown by model calculations that the out-of-plane deformation of the S1 state increases dramatically its rate of internal conversion to the ground state. Thus, although the energy gap for the transition is larger in butadiene than that in octatetraene, the internal conversion S1uS0 is estimated to be 3–5 orders of magnitude faster in butadiene. Fast internal conversion in this molecule explains its lack of fluorescence." @default.
- W1979435023 created "2016-06-24" @default.
- W1979435023 creator A5027738820 @default.
- W1979435023 creator A5087288201 @default.
- W1979435023 date "1990-07-15" @default.
- W1979435023 modified "2023-10-16" @default.
- W1979435023 title "The missing fluorescence of <i>s</i>-trans butadiene" @default.
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- W1979435023 doi "https://doi.org/10.1063/1.459188" @default.
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