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Hitherto, a complete interpretation of the absorption bands of biphenyl has not been given. Therefore, the positions of the electronic transitions as well as their polarizations and oscillator strengths are calculated from the branched electron gas model. For a planar molecule, two transitions result which are polarized parallel to the long axis and which by means of position and oscillator strength may be attributed to the observed transitions at 40 500 cm -1  and 50 000 cm -1 , respectively. Further, two transverse transitions of lower intensity are obtained whose relation to the hidden transitions assumed in earlier papers  1,2,3  is discussed.

Die Berechnung der Elektronenübergänge im Diphenyl nach der Methode des verzweigten Elektronengases