The electron impact spectra of some mono-olefinic hydrocarbonsa)

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Abstract
Electron impact spectra of ethylene, propylene, isobutene, trans‐butene, cis‐butene, trimethylethylene, and tetramethylethylene have been obtained at scattering angles of 0° and 90° and at impact energies from ?20 to 150 eV. The spectra scan an energy‐loss region from 2.5–15 eV. All of the observed Rydberg transitions of the methyl derivatives are correlated to corresponding Rydberg transitions of ethylene. The missing π→3p transitions of ethylene are tentatively located via this correlation. Evidence is also presented for assigning the N→3R′ system of ethylene (at 8.26 eV) to a π→3px transition. Possible assignments of some broad continua above ?8–9eV as σ→π* and σ→σ* transitions are considered. In agreement with other reported large‐angle electron impact spectra, no evidence is obtained for transitions that could be assigned to triplet Rydberg states. However the π→π* triplet transitions are all clearly located with transition energies in good agreement with those obtained by a variety of other techniques.

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