Abstract

The absorption and emission spectra of single crystals of phenanthrene have been studied at 20°K. The data show that the transition moment in the molecule is short-axis polarized, and that the factor group splitting in the crystal is 47 cm—1. The emission originates in a region of very weak absorption at a frequency below the main absorption in analogy to several other molecular crystals whose spectra have been studied. It is suggested that the emitting level corresponds to a distorted lattice site.

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