Appearance potentials and excess kinetic energies have been determined for the ions produced by the ionization and dissociation of nitromethane by electron impact in a mass spectrometer. Bond dissociation energies and mechanisms of fragmentation have been deduced where possible.D(CH3sngbnd;NO2) has been found to be 2.56 volts, a value in agreement with thermochemical data. The dissociation and ionization process yielding NO+, the most abundant ion in the nitromethane mass spectrum, is believed to yield, at the same time, a CH3O radical. A new value for the ionization potential of NO2, 9.91 volts, is reported.
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