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The transitions between complex configurations, to which the giant dipoleresonance (GDR) and the double giant dipole resonance (DGDR) doorway states arecoupled, are taken into account in second order perturbation theory for thereaction amplitude. It is proved that only transitions between GDR and DGDRdoorway states play an essential role in the Coulomb excitation of the DGDR.Comment: 5 pages, 2 postscript figure

Transitions between complex configurations in the excitation of the double giant resonance