Excited electronic states of cyclohexene, 1,4-cyclohexadiene, norbornene, and norbornadiene as studied by electron-impact spectroscopy
Journal Article
·
· J. Chem. Phys.; (United States)
The excited electronic states of cyclohexene, 1,4-cyclohexadiene, norbornene (bicyclo(2.2.1)-2-heptene), and norbornadiene (bicyclo-(2.2.1)-2,5-heptadiene) have been studied by electron impact at scattering angles from 5/sup 0/ to 80/sup 0/, and impact energies of 30 and 50 eV. Low-lying features with intensity maxima at 4.24 eV in cyclohexene and 4.10 eV in norbornene are identified as singlet ..-->.. triplet transitions. Similar features in the spectra of 1,4-cyclohexadiene and norbornadiene extending from 3.4 to 5.4 eV and 2.9 to 4.5 eV, respectively, are believed to result from superposition of two low-lying singlet ..-->.. triplet transitions in each molecule. In norbornadiene these features have estimated intensity maxima at 3.4 and 3.9 eV, while in 1,4-cyclohexadiene they appear to be more highly overlapped, yielding a single intensity maximum at 4.29 eV. The singlet ..-->.. singlet excited state spectra of these molecules are discussed from the point of view of a model in which ethylene units interact via through-bond and through-space effects. In each of these four molecules, transitions to several superexcited states are observed.
- Research Organization:
- Arthur A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125
- OSTI ID:
- 6446563
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 70:4; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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