Abstract
Valence-shell ionization energy spectra (9–49 eV) of cyclopropane were measured at two relative azimuthal angles using symmetric noncoplanar (e, 2e) spectroscopy. The outer-valence spectrum is consistent with a single-particle picture of ionization from each of the five outer-valence orbitals, in agreement with published photoelectron data. Excited ionic states corresponding to many-body, electron correlation processes were observed for cyclopropane above 25 eV, indicating the breakdown of Koopmans' ionization picture in the inner-valence region. Comparison with an earlier Green's function calculation predicting the many-body structure is made. The ratio of intensities in the ionization spectra measured at the two azimuthal angles provides qualitative information on the dominant orbital symmetry of individual ionic states.
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