By using a molecular beam apparatus in combination with a single frequency dye laser we were able to resolve several rovibronic bands in the S1 electronic state of tetracene (C18H12) and its van der Waals complexes with inert gas atoms. The spectra of tetracene have been assigned and rotational constants were derived for the S0 and S1 electronic state. The existence of perturbations in the rotational spectra of the van der Waals complexes is demonstrated.
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Herpen et al. (1987) studied this question.
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