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Low energy, variable angle electron-impact excitation of 1,3,5-hexatriene

✍ Scribed by Wayne M. Flicker; Oren A. Mosher; Aron Kuppermann

Publisher: Elsevier Science
Year: 1977
Tongue: English
Weight: 523 KB
Volume: 45
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(77)80073-0

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✦ Synopsis

A mixture of cis and tram 1,3,5-hcxatricne has been studied by electron impact at incident electron energies of 20 cV, 40 eV, 50 eV. and 70 eV, at scattering angles from 0" to 80", and with effective energy resolutions in the range from 0.05 eV to 0.15 PV. Singlet -L triplet transitions with maximum intensities at 2.61 eV and 4.11 eV are observed. The lowest cncrgy spin-allowed excitation which can be detected is rhc electric dipole-allowed % *A g + 1 ' Bu transirion (in the notation appropriate for the trans isomer). No evidence has been found for a spin-allowed but symmetry-forbidden z *Ag + 2 *Ag excitation in the vicinity of 4.4 eV transition energy. Many other spin-allowed excitations are observed in the 6-11 eV energy-loss region, and the correlation between these features and those observed in high resolution ultraviolet absorption spectra and other electron-impact spectra is discussed.

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