Abstract
The absorption and fluorescence spectra of anthracene in n-heptane, fluorene, and biphenyl matrices have been measured at 4°K. Both in the ground and 1 B 1 u excited electronic states, eight a g and three b 3 g fundamentals have been assigned. Other possible fundamentals, including some nontotally symmetric modes allowed to appear by crystal forces, are indicated. Anharmonicity was detected only by the appearance of a number of examples of Fermi resonance between vibrational modes both in absorption and in fluorescence. No evidence for a second weak electronic transition was found.
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