Abstract
The photoelectron spectrum of molecular oxygen has been studied in the range 12-28 eV with the 584 Å and 304 Å He lines, and the O2+ states have been measured accurately. Due to the high resolution of our apparatus we have been able to observe the A2 Πu state which has been considered as absent in photoelectron spectroscopy work. Its ionization energy is 17.045 eV. Our result is compared with spectroscopic observations of the second negative band system A2Πu → X2Πg.The relative intensity of the A2Πu state is in good agreement with a recent calculation by Dixon and Hull.
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