Abstract
High-resolution threshold photoelectron spectroscopy has been used to study O2 in the 24–50 eV photon energy region, where several broad bands with superimposed fine peaks are observed. Theoretical calculations on the basis of the state-averaged complete-active-space self-consistent-field method followed by the second order configuration interaction method reproduce well the general band features of the threshold photoelectron spectrum, enabling us to assign the bands to inner-valence O2+ states. Dissociation products formed from the inner-valence O2+ states have been investigated by threshold photoelectron–photoion coincidence spectroscopy and their dissociation dynamics discussed with reference to the theoretical potential energy curves.
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