Abstract
Dissociative ionization of ethylene by controlled electron impact has been investigated using a new fragment ion–photon coincidence apparatus. There is a clear correlation between the CH(A–X) emission and H + production. The H + band shape in the spectrum is simulated well, based on the CH(A–X) emission lifetime and H + translational energy. An average translational energy of H + is estimated to be about 0.1 eV. This small value implies sequential dissociation of the parent ion and/or dissociation from a doubly excited state.
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