Abstract
Abstract The valence shell photoionization dynamics of acetylene were studied in the photon energy range 13–140 eV using photoelectron spectroscopy and synchrotron radiation. Photoelectron angular distributions and branching ratios were determined for the X 2Πu, A 2 Σ g + , B 2 Σ u + , C 2 Σ g + single-hole ionic states and for inner valence correlation states. An interpretation of the experimental results was carried out based upon previous theoretical predictions, and it appears that the photoionization dynamics are being strongly affected by shape resonance phenomena. The photoelectron asymmetry parameters associated with the A 2 Σ g + and the C 2 Σ g + ionic states provide the first experimental confirmation of the predicted σu continuum shape resonance.
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