Spectra of isotopically mixed benzene dimers: Details on the interaction in the vdW bond

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Abstract
Isotopically mixed jets of benzene produced the various possible isotopic benzene dimers in a supersonic jet. Mass coincidence in time‐of‐flight multiphotonmass spectra separated the spectra due to the various dimers produced into distinguishable spectra even in the presence of overlap. From the many different isotopic spectral shifts a detailed model of interaction between the two halves of the dimer can be established revealing detailed new information on this interaction. In particular a splitting in the 0–0 transition is reported for the first time indicating an excitoninteraction in the dimer of isotropic identical benzene molecules in the gas phase.