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Ionization Potentials and the Structures of the Photo-ionization Yield Curves of Ethylene and its Halogenoderivatives

Naturevolume 199pages11791180 (1963) | Download Citation



THE problem of interpreting the differences between ionization potentials obtained by electron (E.I.) and by photon impact (P.I.) has led us to a careful examination of the structures occurring in the photo-ionization yield curves of cis and trans dichloro- and dibromoethylenes1–3. The regularly spaced structures found in these curves have been interpreted in terms of vibrational progressions involving the C—C valence vibrations of the ions.

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  1. 1

    Momigny, J., Bull. Acad. Roy. Belg., Cl. Sci., 46, 686 (1960).

  2. 2

    Momigny, J., Nature, 191, 1089 (1961).

  3. 3

    Momigny, J., Bull. Soc. Chim. Belg., 70, 241 (1961).

  4. 4

    Warren, J. W., Nature, 165, 811 (1950).

  5. 5

    Hurzeler, H., Inghram, M., and Morrison, J. D., J. Chem. Phys., 27, 313 (1957).

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  1. Centre de Spectrométrie de Masse de l'Université de Liège

    • J. MOMIGNY


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