Abstract
On the basis of rotationally resolved pulsed field ionization photoelectron measurements, we have shown that the weak vibrational progressions in the energy region of 19.6–21.0 eV observed in recent high resolution photoelectron spectroscopic studies of O2 are associated with transitions to the 2 2Πu 1/2 (2 2Πu 3/2) and 2Σu− states of O2+, with ionization energies of 19.6268±0.0005 eV (19.6329±0.0005 eV) and 20.3528±0.0005 eV, respectively.
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