Absorption spectra of volatile aromatic hydrocarbon films, p-terphenyl, chrysene, benzanthracene and triphenylene, in the near and vacuum ultraviolet region down to 130 nm were measured under an atmosphere of Ar gas to suppress their sublimation. The spectrum of p-terphenyl is different from the spectra reported for other phases. This difference is explained in terms of the change of dihedral angles among the three benzene rings. The peak positions in the spectra of chrysene and bezanthracene agree with those in the solution spectra. The differences in the peak intensities are discussed in terms of the orientation of the films with the aid of MO calculations. The result of triphenylene suggests the presence of Davydov splitting.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry