[Studies on a resonance of carcinogenic benzpyrene (author's transl)].

The alpha- and p-states of 3.4-benzpyrene are calculated by use of common parameters and of a parameter set which predicts the quasi-degeneracy of these states. The quasi-degeneracy will be represented by the breadage of pairing theorem and is to be described as a correlation effect, caused by an asymmetric potential. An external field represents an external perturbation, introduced by interaction with the bioreceptor. The calculation shows a sensitive dependence of probability amplitudes for different configurations which participate in the quasi-degenerated resonance states. Thereby the dipole moment may quickly be changed so that excitons are produced. The resonance phenomenon may lead to the carcinogenic effect.