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- W4310459103 abstract "Electronic excited states in the series of polyene molecules were explored. Optimal ground-state geometry was used for the evaluation of vertical excitation energies. Results of a chosen set of functionals were compared to post-HF methods (EOM-CCSD, NEVPT2, CASPT2, and MRCI). In addition, the semiempirical OM2/MNDO method using MRCISD computational level was confronted with the above-mentioned techniques. Despite the fact that the first excited state has a significant double-excitation character some functionals were able to qualitatively determine the correct state order (where the lowest excited state has a Ag- character). The most successful functionals in transition energies predictions were PBE, TPSS and BLYP in Tamm-Dancoff approach (TDA), which had the smallest root-mean-square deviation (RMSD) scoring towards the experimental values. Regarding RMSD scoring, the OM2/MNDO method performed fairly well, too. Besides absorption spectra, lifetimes of the first two excited states were estimated based on a stochastic approach exploring a swarm of OM2/MNDO hopping dynamics using the Tully fewest switch algorithm for each molecule. The longest lifetime of the first excited state (S1 ) was found for decapentaene (about 5 ps). Further elongation of the conjugated chain caused a mild decrease of this value to ca 1.5 ps for docosaundecaene." @default.
- W4310459103 created "2022-12-10" @default.
- W4310459103 creator A5008660659 @default.
- W4310459103 creator A5042946044 @default.
- W4310459103 creator A5052689331 @default.
- W4310459103 date "2022-11-29" @default.
- W4310459103 modified "2023-10-12" @default.
- W4310459103 title "The vertical excitation energies and a lifetime of the two lowest singlet excited states of the conjugated polyenes from <scp>C2</scp> to <scp>C22</scp>: Ab initio, <scp>DFT,</scp> and semiclassical <scp>MNDO‐MD</scp> simulations" @default.
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