Abstract
The fluorescence excitation and emission spectra of the jet-cooled dimer of carbazole have been obtained. The spectra are assigned and low-frequency vibrations due to intermolecular vibrations are observed. The fluorescence arises from the initially excited state and excimer formation is not observed in contrast to the behaviour of the isoelectronic fluorene dimer. The difference can be explained in terms of differing intermolecular interactions which determine the structure of the ground state dimers. AM1 calculations predict that the carbazole dimer is di-hydrogen bonded and exciton splittings are calculated on the basis of the calculated structure using the point-dipole approximation. One-photon transitions to only one of the excitonic states are observed, as is predicted by symmetry considerations.
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