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Fluorescence excitation and resonant two-photon ionization spectra were measured for 9-ethylfluorene (EFR) molecule cooled in pulsed supersonic expansion of He in the range of 286.5∼300nm. The structures and energies of the global and local minima and the transition states separating them are evaluated with the B3LYP/6-31G(d) and MP2/cc-pVTZ methods. It is found that the vertical excitation energies...
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