Flicker, Wayne M. and Mosher, Oren A. and Kuppermann, Aron (1976) Electron impact investigation of electronic excitations in furan, thiophene, and pyrrole. Journal of Chemical Physics, 64 (4). pp. 1315-1321. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:FLIjcp76
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The electronically excited states of furan, thiophene, and pyrrole have been studied by electron impact at scattering angles from 0° to 80°, and impact energies of 30 and 50 eV. Low-lying features at 3.99 and 5.22 eV in furan, 3.75 and 4.62 eV in thiophene, and 4.21 eV in pyrrole are identified as singlet --> triplet transitions. The locations and, for furan and thiophene, the energy splittings of these excitations suggest that they are analogous to the lowest pi --> pi* singlet --> triplet transitions in benzene, and that these heterocycles have appreciable aromatic character. A weak feature observed in pyrrole at 5.22 eV is attributed to an optically forbidden singlet --> singlet transition. In all three molecules, transitions to several superexcited states are observed.
|Additional Information:||Copyright © 1976 American Institute of Physics. Received 20 March 1975. We would like to thank Mr. Jonathan A. Burke for his able assistance in the gas chromatographic-mass spectral analysis of the pyrrole sample, and computer analysis of the data. Work was supported in part by the United States Atomic Energy Commission under Grant Number AT (04-3)-767-4. Report Code CALT-767P4-134. Work performed [by W.M.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. 5068.|
|Subject Keywords:||FURANS, THIOPHENE, PYRROLES, ELECTRON-MOLECULE COLLISIONS, EXCITATION, EV RANGE 10-100, EXCITED STATES|
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|Deposited By:||Archive Administrator|
|Deposited On:||02 Oct 2008 21:49|
|Last Modified:||26 Dec 2012 10:21|
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