Dissociative Photoionization of O2

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Abstract
Energy distributions of the ions produced in the dissociative photoionization of O2 have been measured with photons in the spectral interval 584–358 Å. Tentative identifications of several ion groups with particular states of the O2+ molecular ion have been made. Mass spectrometric measurements were carried out with a pulsed, slitless mass spectrometer to identify the ions produced with 584 radiation and to confirm the production of energetic ions. It is concluded that mass spectrometer discrimination against energetic ions may have caused an understimate of the amount of dissociative photoionization produced by wavelengths shorter than 584 Å.