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Abstract
Recent interpretations of photoelectron spectra of benzene and water in terms of vanishing cross-sections for ionisation of certain σ-orbitals by He 584 Å radiation are criticized. It is shown that the evidence that was cited in support of this concept was inconclusive and that alternative explanations exist. The evidence is shown to point to the use of Helium 584 Å (or higher-energy) radiation as a significant factor in avoiding anomalous spectral features. The discrepancies between theoretical calculations of molecular orbital structure and the results of He 584 Å photoelectron spectroscopy may be ascribable to deviations from the Koopmans' Theorem basis.
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