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

Journal Article · Sun Feb 15 04:00:00 UTC 1976 · J. Chem. Phys., v. 64, no. 4, pp. 1315-1321

DOI:https://doi.org/10.1063/1.432397· OSTI ID:4003733

Flicker, W M; Mosher, O A; Kuppermann, A

The electronically excited states of furan, thiophene, and pyrrole have been studied by electron impact at scattering angles from 0degree to 80degree, 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 $Yields$ triplet transitions. The locations and, for furan and thiophene, the energy splittings of these excitations suggest that they are analogous to the lowest $pi$ $Yields$ $pi$* singlet $Yields$ 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 $Yields$ singlet transition. In all three molecules, transitions to several superexcited states are observed. (AIP)

• Research Organization: Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-027256
• OSTI ID: 4003733
• Journal Information: J. Chem. Phys., v. 64, no. 4, pp. 1315-1321, Journal Name: J. Chem. Phys., v. 64, no. 4, pp. 1315-1321; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

*FURANS-- ELECTRON-MOLECULE COLLISIONS
*PYRROLES-- ELECTRON-MOLECULE COLLISIONS
*THIOPHENE-- ELECTRON-MOLECULE COLLISIONS
640304* --Physics Research--Atomic
Molecular & Chemical Physics--Collision Phenomena
EV RANGE 10-100
EXCITED STATES
N60400* --Physics (Atomic & Molecular)--Collision Phenomena