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Photodissociation spectrum of cyanobenzene dimer cation. Absence of intermolecular resonance interaction Ohashi, Kazuhiko Nishiguchi, Masaharu Inokuchi, Yoshiya Sekiya, Hiroshi Nishi, Nobuyuki 430 Electronic spectra of a homo-molecular dimer cation, (C6H5CN)2+, are measured by photodissociation spectroscopy in the gas phase. Broad features appeared in the 450–650 nm region are characteristic of π3 → πCN transitions of the C6H5CN+ chromophore. No intense band is observed in the 650–1300 nm region, where other aromatic dimer cations usually show charge resonance bands. Two component molecules of (C6H5CN)2+ cannot take a parallel sandwich configuration suitable for the resonance interaction, because of geometrical constraints due to other stronger interactions. This work was supported in part by a Grant-in-Aid for Scientific Research (No. 09740450) from the Ministry of Education, Science, Sports and Culture of Japan. This is a postprint of an article published by Springer Netherlands in Research on Chemical Intermediates, 1998, available online: http://doi.org/10.1163/156856798X00393 http://purl.org/coar/resource_type/c_6501 Springer Netherlands 1998-07 AO 0922-6168 755 Research on Chemical Intermediates 7 24 764 755 Research on Chemical Intermediates https://hiroshima.repo.nii.ac.jp/records/2008751 eng http://doi.org/10.1163/156856798X00393 10.1163/156856798X00393 open access (c) VSP 1998