Abstract
High resolution core and valence X-ray photoelectron spectra of biphenyl, p-terphenyl, p-quaterphenyl and p-polyphenyl clarify the electronic structure of these aromatic compounds. Comparison with similar data for the lowest acenes (benzene, naphthalene, anthracene and tetracene) and polystyrene permits an evaluation of electron delocalization in relation to the electrical properties. Energy gaps of 5.8 eV for polystyrene and 4.0 eV for p-polyphenyl are obtained.
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