Dimers of Aromatic Molecules: (Benzene)(2), (Toluene)(2), and Benzene-Toluene.
COLORADO STATE UNIV FORT COLLINS DEPT OF CHEMISTRY
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The optical absorption spectra of the first excited singlet states of the benzene, toluene, and toluene-benzene dimes, created in a supersonic molecular jet, are reported. The absorption spectra are detected through two-color time of flight mass spectroscopy this method eliminates fragmentation of dimers and higher clusters and the dimer spectra are uniquely observed. The benzene dimer observed in this experiment is suggested to have a parallel stacked and displace configuration of C sub 2H symmetry. Both the toluene and toluene-benzene dimers have two configurations parallel stacked and displaced based on benzene2 and perpendicular. Benzene2, toluene2, and toluene-benzene form excimers in the excited state for the parallel stacked displaced configurations. The transformation of benzene2 to the excimer takes place at the 0 deg with approx. 0cm barrier while the excimer is formed for toluene-benzene with a approx. 900cm barrier. An exciton analysis of the benzene 0 deg and approx. 6 superscript 1 yields M sub 12, the excitation exchange interaction, equal to approx. 1.6 cm.
- Polymer Chemistry
- Atomic and Molecular Physics and Spectroscopy