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 A 2 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 A 2Πu → X 2Πg. The relative intensity of the A 2Πu state is in good agreement with a recent calculation by Dixon and Hull.

The photoelectron spectrum of NO2 has been measured with high resolution up to 27.5 eV and interpreted by use of molecular orbital theory, taking especially the vibrational structure into account. The electron impact energy loss spectrum has been measured with electron energy 100 eV. The spectrum above 6.5 eV has been interpreted as due to Rydberg transitions and comparison with spectroscopic measurements have been made.

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