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- W2068668198 abstract "Excited state properties of fluorobenzene, chlorobenzene, bromobenzene, and iodobenzene have been investigated theoretically using multireference CASSCF and CASPT2 methods. Experimentally, chlorobenzene and bromobenzene are known to exhibit one fast dissociation channel, whereas iodobenzene exhibits two fast dissociation channels. The calculations indicate that the chlorobenzene, the bromobenzene, and the slower iodobenzene dissociation channels are due to intersystem crossings from a bound (π,π*) singlet excited state to a repulsive (n,σ*) triplet excited state. The faster iodobenzene dissociation channel is instead found to be caused by a direct dissociation of an antibonding (n,σ*) singlet excited state. The CASPT2 calculations predict that the onset of fluorobenzene photodissociation should occur around 196 nm, with a single time constant longer than 1 ns. CASSCF geometries and accurate MSCASPT2 calculated vertical excitation energies are presented for the ground state as well as the first excited singlet and triplet states of all the monohalobenzenes." @default.
- W2068668198 created "2016-06-24" @default.
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- W2068668198 date "2004-03-01" @default.
- W2068668198 modified "2023-09-24" @default.
- W2068668198 title "Theoretical Study of the Fast Photodissociation Channels of the Monohalobenzenes" @default.
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- W2068668198 doi "https://doi.org/10.1021/jp0379648" @default.
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