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Articles you may be interested inDielectric tensor of tetracene single crystals: The effect of anisotropy on polarized absorption and emission spectra Absorption spectra of carbazole polarized parallel to a and b crystallographic axes have been obtained for first and second singlet systems. Vibrational fundamentals observed for the first excited state consist of Al species which indicates that the first electronic transition is along the short axis of the molecule (AI---->AI)' Polarization study, however, reveals that the transition is along the short axis together with some out-ofplane component. An attempt to explain the out-of-plane component has been made on the basis of a slight nonplanarity of the molecule in the crystal lattice. From the relative intensity of the first two absorption systems in solution and crystal phase and with the knowledge of molecular orientation in the crystal lattice, it has been concluded that the second-lowest electronic transition is along the long axis of the molecule (A1---->B 2 ).

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