Negative ion mass spectrum of the resonance electron capture by molecules of p-benzoquinone

The negative ion mass spectrum of the resonant electron capture by molecules of p-benzoquinone has been recorded. It has been found that apart from the well-known earlier five types of negative fragmental and long-lived molecular ions, 17 more types of other fragmental ions are produced in this compound. The scheme of the molecular ion decay has been composed for each dissociation channel, where the choice has been given to the structures of the dissociation products which in accordance with MNDO calculations have the minimal total energies. The effective yield curves of the negative ions have been recorded as functions of the electron energy. It has been also assumed that the long-lived negative molecular ions of p-benzoquinone are formed, probably, in two resonant states close in energy and poorly resolved: at 1.36 and 1.56 eV.