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- W1999388637 abstract "MCSCF and MRCI calculations on the first three singlet states of cis-1,3-butadiene are presented. Flexible basis sets were applied and full geometry optimization was carried out at the MCSCF level for planar and selected non-planar structures including twisting and pyramidalization of the terminal CH2 groups. Geometry relaxations in and excitation energies to the 1 1B2 and 2 1A1 states are discussed in detail. For planar structures the covalent 2 1A1 state is lower in energy than the 1 1B2 state. If non-planar geometry relaxations are allowed we find that among the structures considered the lowest-lying non-planar excited singlet state is ionic with one terminal CH2 group rotated by 90°. A detailed comparison with the results on trans-butadiene is also given." @default.
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- W1999388637 date "1990-03-01" @default.
- W1999388637 modified "2023-10-14" @default.
- W1999388637 title "Geometry relaxation effects in the 1 1B2 and 2 1A1 states of cis-1,3-butadiene" @default.
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- W1999388637 doi "https://doi.org/10.1016/0301-0104(90)87069-n" @default.
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