Polarization of the First Two Electronic Transitions of Pyrene

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Abstract
The polarization of the first two electronic transitions in the pyrene molecule have been determined by measuring the absorption spectra in polarized light of oriented single crystals containing pyrene. The lowest molecular level (3700 A) is assigned as 1B3u on the basis of the polarized absorption spectrum at room temperature of pyrene in phenanthrene. The second (3500 A) molecular level is assigned as 1B3u from the polarized spectrum of pyrene in dibenzyl. Although this result agrees with previous experimental evidence the assignments are at variance with theoretical predictions and thus suggest that a new model is necessary to predict the molecular levels of pericondensed hydrocarbons.

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