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Electronic Structure of Dimethylenecyclobutane-1,3-dione.  Photoelectron
Spectroscopic Investigation'

Marie-Claire Lame and Jean-Louis Ripoll
Laboratoire  de Chimie des Composls thioorganiques, UA  480, Universitl de Caen, 14032 Caen, France
Christophe Lafon, Daniele Gonbeau, and Genevieve Pfister-Guillouzo*
Laboratoire  de Physico-Chimie Mollculaire, UA  474, Institut Universitaire de Recherche  Scientifique,
64000 Pau, France
Received  April  15, 1986
The He I PE spectrum of  the transient title compound has been obtained by using the variable-temperature
photoelectron spectroscopy technique.  Agreement between  the CIPSI calculations and experimental ion-state
energies is very good.  The electronic structure of this molecule  is characterized by a net circumannular interaction
and strong polar effects.

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