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Electron coincidence spectroscopy of O2: Valence electron momentum distributions and binding energies
Authors:I. H. Suzuki   E. Weigold  C. E. Brion
Affiliation:

Institute for Atomic Studies, The Flinders University of South Australia, Bedford Park, South Australia 5042 Australia

Abstract:The binding energy spectra and momentum distributions for the valence orbital transitions of molecular oxygen have been obtained using the (e,2e) reaction at total electron energies of 400 and 1200 eV. The outer πg orbital is found to have a wave-function which is significantly more extended in momentum space than that of the more-tightly bound πu orbitals. This is interpreted as a consequence of the single occupancy of the anti-bonding πg orbitals. Peaks at 39 and 47 eV are assigned to 4,2Σg ion states on the basis of the observed momentum distributions. The momentum distribution and observed intensity for the 32.5 eV transition supports the assignment of 2 Πu for this ion state. The measured relative strengths for the various Πu and Σu transitions are in qualitative agreement with CI and Green's function calculations.
Keywords:
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