The Interactions in the Benzene Dimer in a Supersonic Jet: Study of the S1 level with isotopic labelling

Abstract

The S₁ energy levels of isotopically mixed benzene dimers are studied in a supersonic expansion. In the benzene dimer the O-O transition which is forbidden in the bare molecule is weakly allowed. The spectra show a small splitting for the homodimer and a single transition for the heterodimer, and an additional red shift of the homo dimer transition.