Electron transmission spectra and mass spectra of negative ions from dissociative electron attachment have been obtained for four series of halogenated alkenes: vinyl halides, chloroethylenes, halobenzenes, para-dihalobenzenes. The stabilizing effect of halogen substituents upon anion state energies is obvious. Systematic observations permit assignment of ∑ and ∏ anion states. Dissociative attachment usually proceeds through the ∏ anion state. An enormous enhancement of the cross section for dissociative attachment of threshold electrons is observed in some cases.
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Olthoff et al. (1985) studied this question.
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