Abstract

Photoelectron angular distribution parameters for the first three valence-shell photoionizations of cyanoacetylene, for the first one also vibrationally resolved, were measured using synchrotron radiation in the photon energy range from 13.5 to 28.0 eV. LCAO (linear combination of atomic orbitals)/MS Xα MO (multiple scattering Xα molecular orbital) photoelectron angular distribution parameters and photoionization cross sections were computed for photon energies up to 28.0 eV. The comparison between theory and experiment revealed the presence of shape resonances in the first two ionization processes.

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