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(all-E)-1,3,5,7-Octatetraene: Electron-Energy-Loss and Electron-Transmission Spectra

✍ Scribed by Michael Allan; Louis Neuhaus; Edwin Haselbach

Publisher
John Wiley and Sons
Year
1984
Tongue
German
Weight
398 KB
Volume
67
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Electron‐energy‐loss and electron‐transmission spectra of (all‐E)‐1,3,5,7‐octatetraene were recorded with a trochoidal electron spectrometer. The energy‐loss spectra reveal two triplet states at 1.73 and 3.25 eV (0,0‐transitions), the UV‐active 1^1^B~u~ state at 4.40 eV, and a higher‐lying singlet state at 6.04 eV. The 2^1^A~g~ state recently reported to be the lowest excited singlet state in this polyene, could not be observed. This failure is probably de to a small excitation cross section under the scattering conditions used and the presence of the second triplet sate in the pertinent energy region. The electron‐transmission spectrum revealed three resonances (i.e. short‐lived anion states) at 1.5, 2.5, and 4.15 eV.

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