Frueholz, Robert P. and Flicker, Wayne M. and Mosher, Oren A. and Kuppermann, Aron (1979) Electronic spectroscopy of benzene and the fluorobenzenes by variable angle electron impact. Journal of Chemical Physics, 70 (6). pp. 3057-3070. ISSN 0021-9606 http://resolver.caltech.edu/CaltechAUTHORS:FRUjcp79c
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Electron-impact spectra of benzene and 11 fluorine-substituted derivatives have been obtained at impact energies of 75, 50, and either 25 or 30 eV, and scattering angles from 5° to 80°. Each molecule shows an absorption maximum at about 3.9 eV corresponding to a singlet-->triplet, pi-->pi*, transition. In benzene, fluorobenzene, o- and m-difluorobenzene, and 1,3,5-trifluorobenzene, an additional singlet-->triplet excitation was detected at about 5.7 eV. Three singlet-->singlet transitions analogous to the 4.90, 6.20, and 6.95 eV benzene excitations are seen in each of the fluorine-substituted molecules. The more highly substituted compounds exhibit an additional singlet-->singlet transition, which we designate as the C band system, that is most clearly observed in the hexafluorobenzene spectrum, where it has a peak at 5.32 eV. We briefly discuss the effects on relative transtion intensities due to the different molecular symmetries of the various fluorobenzenes. We also report numerous superexcited states for each molecule studied.
|Additional Information:||Copyright © 1979 American Institute of Physics. Received 1 June 1978. This work was supported in part by a contract (No. ET-76-S-03-767) from the Department of Energy. Report Code: CALT-767P4-169. Work performed [by R.P.F.] in partial fulfillment of the requirements for the Ph.D. Degree in Chemistry at the California Institute of Technology. Arthur Amos Noyes Laboratory of Chemical Physics, Contribution No. 5800.|
|Subject Keywords:||ELECTRON−MOLECULE COLLISIONS, BENEZENE, FLUORINATED AROMATIC HYDROCARBONS, EV RANGE 10−100, ABSORPTION SPECTRA, ULTRAVIOLET SPECTRA, ENERGY−LEVEL TRANSITIONS|
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|Deposited On:||11 Aug 2008 20:14|
|Last Modified:||26 Dec 2012 10:13|
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