Abstract
Dissociative ionization in O 2 has been examined by means of a retarding potential lens combined with a quadrupole mass spectrometer. This particular arrangement made possible detailed analysis of the O + ions kinetic energy distribution and the measurement of threshold energies of O + ions with known kinetic energy. These two types of informations bring new experimental evidence, besides direct dissociative ionization of O 2, for predissociation of the B 2Σ g − state, the 2Π u state and the c 4Σ u − state of O 2 +. A new predissociation of the O 2 +( 2Δ g) state has been found. At low ion-energy the predissociation of the 2Φ u state or an autoionizing predissociation is observed.
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