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Electron impact investigation of electronic excitations in furan, thiophene, and pyrrole

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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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.432397DOIUNSPECIFIED
http://link.aip.org/link/?JCPSA6/64/1315/1PublisherUNSPECIFIED
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.
Funders:
Funding AgencyGrant Number
Atomic Energy CommissionAT (04-3) 767-4
Subject Keywords:FURANS, THIOPHENE, PYRROLES, ELECTRON-MOLECULE COLLISIONS, EXCITATION, EV RANGE 10-100, EXCITED STATES
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Arthur Amos Noyes Laboratory of Chemical Physics5068
CALTCALT-767P4-134
Record Number:CaltechAUTHORS:FLIjcp76
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:FLIjcp76
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11832
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:02 Oct 2008 21:49
Last Modified:26 Dec 2012 10:21

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