Mass-Spectrometric Study of Photoionization. IV. Ethylene and 1,2-Dideuteroethylene

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Abstract
Photoionization‐efficiency curves for ions of the molecule and of selected fragments of C2H4 and CHDCHD are reported for the wavelength region from onset of ionization to 600 Å. The minimum threshold of ionization is 10.50 eV for both molecules. In addition, certain features of the ion‐yield curves are discussed and identified as resulting from vibrationally excited states or from autoionization from Rydberg levels leading to electronically excited states. Threshold measurements of the acetylene ions permit calculation of heats of dissociation and indicate that the C2H2+ ion is formed without excess activation energy. Of the vinyl ions, the threshold for the C2H3+ ion is the most clearly defined and leads to a C2H3–H bond‐dissociation energy of 100 kcal·mole−1.

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